Version 1.0.65 - 2023-04-16   Bug fix. Change in multiple-response re-do trigger.
Version 1.0.64 - 2023-04-15   Automatically get oclc-wi if needed to obviate need to get oclc-wi via Author/Title.  This automatically turns on saving all LC Identifiers, regardless of customization.  
Version 1.0.63 - 2023-04-14   Miscellany
Version 1.0.62 - 2023-04-13   Miscellany
Version 1.0.61 - 2023-04-12   Add back self.detect_isbn_changes_to_refresh.
Version 1.0.60 - 2023-04-06   LCEAD preferences and widgits removed from within Customization.
Version 1.0.59 - 2023-04-06   Miscellaneous technical improvements.  Also, the LCCN Identifier values are automatically converted so that they may be used as-is with the URL to the Library of Congress Permalinks to the book's author. The format for one possible Permalink is:  https://lccn.loc.gov/n80126289 where the n80126289 is the LCCN value from Library Codes.  A better link to it is:  https://id.loc.gov/authorities/names/n80126289.html  You may set either of these links in Calibre > Preferences > Look & Feel > Book Details.  
Version 1.0.58 - 2023-04-05   Enhancments to increase speed of execution of LC, plus other technical improvements.
Version 1.0.57 - 2023-04-05   Enhancement to add a new menu item to use a book's Author & Title to download its OCLC-WI Identifier, which in turn can be used in lieu of a missing ISBN/ISSN to download the same metadata (DDC, LCC, FAST Tags, etc.) that ISBN/ISSN would make available if they were not missing.  Enhancements to download more metadata.  Changes to ToolTips.  Changes to Customization.
Version 1.0.56 - 2023-04-01   Streamlined the new "no Classify API", webscraping-based version of LC, to remove deprecated functions requiring the old Worldcat API.  New: added the creation of 3 Identifiers:  OCLC-OWI; OCLC-WORLDCAT; VIAF_AUTHOR_ID.  LC Customization revised to be consistent with both of the previous.
Version 1.0.55 - 2023-03-31   No API:  Life-Support Replacement for API that requires a Key since December 2022.
Version 1.0.54 - 2023-01-18   Qt.core.   
Version 1.0.53 - 2022-07-14   Enhancements to the "eBook"/"Book" criteria for multi-work responses.
Version 1.0.52 - 2022-04-19   If a return code of '4' is received, and its attributes include 'wi' (not 'owi'), create a new RC of '2' using the syntax http://classify.oclc.org/classify2/Classify?wi=nnnnnnn
Version 1.0.51 - 2022-03-19	   Qt6 compatibility.  Minimum Calibre version 6.0.0
"eBook" added to "Book" as a possible work type for multi-work responses from Classify's API.
Version 1.0.50 - 2020-12-22    Miscellaneous Technical changes.
Version 1.0.49 - 2020-12-15    Miscellaneous technical improvements.
Version 1.0.48 - 2020-11-24    Favourites plugin accommodation.
Version 1.0.47 - 2020-08-11	   Qt tweaks for small displays.
Version 1.0.46 - 2020-07-22	   New menu option to remove redundant LCEAD Tags that already exist as FAST Tags for the same selected books.  
Version 1.0.45 - 2020-07-17    Major webscraping rewrites due to Worldcat site changes.  Configuration Dialog greatly enhanced for both validation of user settings and ToolTips.
Minimum Calibre Version remains 4.6.  BeautifulSoup 3 is no longer supported.  Tested in Calibre 5 Beta 4.99.7 and required no changes.
Version 1.0.44 - 2020-07-12    Miscellaneous technical changes to customization and ToolTips.
Version 1.0.43 - 2020-07-02    Additional DEBUG statements added; Technical change to customization.
Version 1.0.42 - 2019-12-30    Technical changes after Python 3.8 testing with Calibre 4.99.2
Version 1.0.41 - 2019-04-30    Python 3 compatibility
Version 1.0.40 - 2019-04-27    Python 3 compatibility & Calibre Version 3.41.3 pdf-to-html compatibility (ISSN extraction from PDFs)
Version 1.0.39 - 2019-04-13    Use standard Calibre's BeautifulSoup, and choose bs3 .findAll or bs4 .find_all dynamically based on its attributes
Version 1.0.38 - 2018-10-15    Version 1.037 functionality has been removed in favor of using the Job Spy plugin's Scrub Tags tool.
Version 1.0.37 - 2018-10-14    LCEAD Tags and FAST Tags: option to prepend any specified prefix to each Tag.
Version 1.0.36 - 2018-10-12    FAST Tags: more work.
Version 1.0.35 - 2018-10-11    FAST Tags added to LC Customization.  FAST retrieved as Tag-Like.
Version 1.0.34 - 2018-05-17    Function "Find Alternatives to a Non-Responsive ISBN" has been redesigned due to current Google Search Books API restrictions.
Version 1.0.33 - 2018-05-16    Function "Extraction of ISSN from PDF periodicals" changed to reflect Calibre changes to its pdf-to-html function.
Version 1.0.32 - 2018-05-15    Techncial and functional enhancements to ISBN scrubbing.
Version 1.0.31 - 2018-05-13    Enhanced scrubbing of ISBNs.
Version 1.0.30 - 2017-05-21    Technical changes.
Version 1.0.29 - 2017-05-11    Technical changes for Calibre 3.0.0 compatibility.
Version 1.0.28 - 2017-05-05    Allow themes with user-defined icons.
Version 1.0.27 - 2016-06-24    Compatibility improvement for use with Linux and OSX
Version 1.0.26 - 2016-05-26    Bug fix.
Version 1.0.25 - 2016-05-25    Technical changes.
Version 1.0.24 - 2016-04-02    DDC Pie Charts
Version 1.0.23 - 2016-03-26    Attempt to solve OSX subprocess issue.
Version 1.0.22 - 2016-03-23    Technical changes.
Version 1.0.21 - 2016-03-22    Revised LCC to Genre mapping logic, plus a corresponding template CSV file.
Version 1.0.20 - 2016-03-21    New:  Updating of #genre (or any other text custom column) by mapping the DDC or LCC to Table _lc_genre_mapping, which is automatically seeded with over 2,470 DDC rows.
Version 1.0.19 - 2016-02-14    Miscellaneous enhancements.
Version 1.0.18 - 2016-02-13    Technical changes to improve performance in extracting ISSNs from PDFs.
Version 1.0.17 - 2016-02-13    New: ISSN Extraction from Magazine/Periodical PDFs for use in deriving DDC, LOC, etc.
Version 1.0.16 - 2016-01-30    Technical changes to improve performance in webscraping.
Version 1.0.15 -  2015-12-04   New Menu Option:  Attempt to Substitute Non-Responsive ISBN Using Author/Title [Selected Single Book]; Technical tweaks.
Version 1.0.14 -  2015-12-02   Many enhancements, especially to using 'OCLC-OWI" to retrieve 'OCLC' which in turn is used to retrieve 'LOC_LCCN'.  Menu and ToolTips changes.  BISAC-type LCEAD column data for Fiction is now retrieved (Non-Fiction already was).
Version 1.0.13 -  2015-11-30   New Identifier:  'LOC_LCCN', which is the  'Library of Congress-LCCN'.  For books assigned LOC LCCNs after the year 1999, they (probably) have a permalink of: http://lccn.loc.gov/NNNNNNNNNN where the LCCN is a 10-digit number starting with the year (2NNN)
Version 1.0.12 -  2015-11-25   Technical tweak.
Version 1.0.11 -  2015-11-25   Additional LCEAD using OCLC.  Most useful for Factual/Non-Fiction.  Since LCEAD column is Tag-Like, any 'commas' have been replaced with the 'comma-like' Unicode symbol 'ˏ' that does not confuse Calibre.
Version 1.0.10 -  2015-11-24   New Identifier:  OCLC (Not the same as OCLC-OWI).  OCLC is extremely useful in retrieving LCEAD data.
Version 1.0.9 -  2015-11-23     New Optional Custom Column: LC Extra Author Details (LCEAD), which is a Tag-Like column that is updated with additional author-related information.  It is automatically updated when deriving DDC/LCC, but can be separately updated via its own menu option that uses OCLC-OWI to obtain the LCEAD values.
Version 1.0.8 -  2015-11-21     Deriving ISNI and LCCN Identifiers from VIAF Author ID:  speed of download improved significantly.
Version 1.0.7 -  2015-11-20     New option to delete all non-Library Codes Identifiers.
Version 1.0.6 -  2015-11-20     2 New Identifiers:  ISNI and LCCN derived from VIAF Author ID to enable hot-linking to ISNI.org and Worldcat.org, respectively.  This is done whenever a OCLC-OWI Identifier is otherwise created.
Version 1.0.5 -  2015-11-19     Creation of 2 Identifiers, VIAF.org Author ID and Library of Congress Author Name ID, whenever OCLC-OWI Identifier is otherwise created.  This allows the use of composite custom columns to hot-link to the respective URLs to view extended Author and Book information.
Version 1.0.4 -  2015-11-17     New option to convert ISBN-10s to ISBN-13s.
Version 1.0.3 -  2015-11-16     New option to derive DDC and/or LCC indirectly using Author/Title via OCLC-OWI Identifiers for cases where ISBN is not useful or reliable.
Version 1.0.2 -  2015-11-13     Menu changes.
Version 1.0.1 -  2015-11-12     Technical tweak.
Version 1.0.0 -  2015-11-03     Initial release.