Version 1.0.78 - 2023-01-12 Qt.core.  
Version 1.0.77 - 2022-11-30 Miscellany.  Minimum Calibre version now 6.0.0.
Version 1.0.76 - 2022-04-14 Miscellany.  Minimum Calibre version now 5.99.8.
Version 1.0.75 - 2022-04-06 Enhanced the Comparison Tab Feature "Show Full Listing [All Books]"
Version 1.0.74 - 2022-04-05 Collection Comparison ToolTips enhanced.  New Comparison Tab Feature: Show Full Listing [All Books].
Version 1.0.73 - 2022-04-03 Collection assignment now uses a 3d potential #zotero_key Custom Column value in addition to the Calibre Identifiers zkey and zkey_file.
This 3d source is rarely useful, but compensates for "drift" between Zotero and Calibre for items originally imported from a Zotero exported .csv file.
Version 1.0.72 - 2022-03-25 Qt6 Compatibility for Calibre Version 5.99.8+.  Technical changes.
Version 1.0.70 - 2020-12-14 Technical changes.
Version 1.0.69 - 2020-12-13 Compatibility changes for Calibre 5.7.  Minimum Version now 5.7.
Version 1.0.68 - 2020-07-20 Qt tweaks so ZMI dialog displays the same in Linux as it does in Windows.
Version 1.0.67 - 2020-07-13 RIS File export:  add new pushbutton for exporting L1/L4 Tags that have the absolute path of the respective Calibre book 
(instead of the path of the intermediate temporary file) to provide the ability to "Link" to the original Calibre book rather than importing into Zotero
the physical book file itself.
Version 1.0.66 - 2020-07-09 Python 3 compatibility, especially for users who had never previously first used Python 2 ZMI.
Version 1.0.65 - 2020-04-24 Regression testing and a general tune-up.  Suggestion: Add the 'Mark Books' action to the 'Context Menu' via 'Preferences > Toolbars & Menus > Context Menus'.
Version 1.0.64 - 2020-04-02 RIS tag "AU": {authors} OR {author_sort}; ToolTips for RIS Export configuration revised accordingly.
Version 1.0.63 - 2020-01-03 Technical changes after Python 3.8 testing with Calibre 4.99.2
Version 1.0.62 - 2020-01-02 Technical changes after Python 3.8 testing with Calibre 4.99.2
Version 1.0.61 - 2019-11-15 Miscellaneous Technical Changes.
Version 1.0.60 - 2019-05-30 Python 3 compatibility.  Minimum Calibre version now 3.41.3.
Version 1.0.59 - 2018-04-12 Miscellaneous enhancements.
Version 1.0.58 - 2018-04-11 New: Add the Zotero Key to each just-exported Calibre book after its import into Zotero so that the ZMI:Comparison Tab functionality may be used for both books imported from Zotero and Zotero books imported from Calibre.
Version 1.0.57 - 2018-04-07 New: RIS Export Tag L4 for Ebook file attachments
Version 1.0.56 - 2018-04-07 New: RIS Export Tag L1 for PDF file attachments
Version 1.0.55 - 2018-04-05 Beta: Activated RIS Export Tag L1 for PDF file attachments
Version 1.0.54 - 2018-04-04 Beta: Added RIS Export Tag L1 for .PDF Files
Version 1.0.53 - 2017-10-22 New ZMI option to create an empty book if the sole file attachment is html.
Version 1.0.52 - 2017-10-21 Technical tweaks re: showing all incomplete books.
Version 1.0.51 - 2017-09-23 Miscellaneous tweaks.
Version 1.0.50 - 2017-09-22 Functionality changes for Calibre 3.8.0 compatibility related to setting the 'covers' for newly imported Zotero 'books'.
Version 1.0.49 - 2017-08-04 New ZMI Tab: Export RIS File.  Export Calibre metadata as .ris file designed specifically for import into Zotero.
Version 1.0.48 - 2017-07-28 Fixed regression error in mark/select new ZMI book interaction.
Version 1.0.47 - 2017-07-27 Miscellaneous tweaks.
Version 1.0.46 - 2017-07-26 Miscellaneous Enhancements.
Version 1.0.45 - 2017-07-25 Fixed item "title".
Version 1.0.44 - 2017-07-25 Comparison Tab enhancements.
Version 1.0.43 - 2017-07-24 Enhancement to capture Zotero Collection for all Calibre books regardless of whether it is a file attachment or not.
Version 1.0.42 - 2017-07-23 Technical changes for Zotero 5.0 Compatibility (e.g. change in column name in Zotero table itemAttachments).
Version 1.0.41 - 2017-06-11  Technical changes for Calibre 3.0.0 compatibility.
Version 1.0.40 - 2017-05-21  Technical changes.
Version 1.0.39 - 2017-05-12  Technical changes for Calibre 3.0.0 compatibility.
Version 1.0.38 - 2017-05-05  Allow themes with user-defined icons.
Version 1.0.37 - 2017-01-17  ToolTip tweaks.
Version 1.0.36 - 2017-01-14  Technical changes to account for variability in Zotero .csv file data.
Version 1.0.35 - 2016-08-12  "List Failed Adds" fixed.
Version 1.0.34 - 2016-08-12  Implemented the new features of Calibre 2.64 Custom Columns datatype of 'comments'.  Zotero Custom Columns have been changed to always be 'long-text' with the heading on the 'side' of the book detail pane.
Version 1.0.33 - 2016-07-20 Changed temporary file creation for "empty books" to avoid failures.
Version 1.0.32 - 2016-07-20 Enhancement to the handling of complex html files having many associated images and javascript files that need to be zipped together prior to adding to Calibre.
Version 1.0.31 - 2016-07-19 Repair any invalid or corrupt file attachment path values during the import process.
Version 1.0.30 - 2016-07-19 New: User options to copy Zotero automatic and/or manual tags to Calibre Tags.
Version 1.0.29 - 2016-07-18 Changes to 'Compare Zotero Database to Calibre Database' to take advantage of the new Identifier 'zkey_file'.
Version 1.0.28 - 2016-07-18 Major enhancements.  New Identifier:  zkey_file.  New user option to import .html file attachments as Calibre "books", although Calibre will automatically convert them into .zip formatted books.
Those must then be manually converted from .zip to .epub to be readable. New user option to import "empty books" for Zotero items that have no file attachments.
Version 1.0.27 - 2016-07-15 Miscellaneous enhancements; New Calibre Identifier of 'zcollection' is updated for books with their matching Zotero collection name automatically whenever the Compare function is executed for their Zotero collection.
Version 1.0.26 - 2016-07-15 New: Compare Zotero Database to Calibre Database to find Zotero books missing from Calibre.
Version 1.0.25 - 2016-07-13 Miscellaneous enhancements.
Version 1.0.24 - 2016-07-12 Miscellaneous enhancements.
Version 1.0.23 - 2016-07-07 New: 'Auto-Select Multiple CSV Files' then Auto-Process all of them simultaneously.  Afterwards, archive or delete the original CSV files.
Version 1.0.22 - 2016-07-06 Miscellaneous enhancements.
Version 1.0.21 - 2016-07-05 Technical enhancements.
Version 1.0.20 - 2016-07-04 Technical enhancements.
Version 1.0.19 - 2016-07-03 Enhancements to increase the efficiency of the ZMI 'process'.
Version 1.0.18 - 2016-07-02 Miscellany.
Version 1.0.17 - 2016-07-01 Many small enhancements to increase the efficiency of the ZMI 'process'.
Version 1.0.16 - 2016-06-30 New options to enhance the efficiency of the ZMI 'process'.
Version 1.0.15 - 2016-06-30 New: Progress Dialog with ability to cancel; miscellaneous tweaks; ToolTip enhancements.
Version 1.0.14 - 2016-06-30 Major Enhancements.
Version 1.0.13 - 2016-06-28 Changes.
Version 1.0.12 - 2016-06-28 Major Enhancements.
Version 1.0.11 - 2016-06-28 Enhancements.
Version 1.0.10 - 2016-06-27 Major enhancements.
Version 1.0.9 -  2016-06-27 New CSV-related error messages to assist in correcting CSV data issues.
Version 1.0.8 -  2016-06-27 Enhancements.
Version 1.0.7 -  2016-06-26 Enhancements.
Version 1.0.6 -  2016-06-26 Major enhancements.
Version 1.0.5 -  2016-06-25 Major enhancements.
Version 1.0.4 -  2016-06-24 New Identifier: DOI (Document Object ID) added from ZDoi.  New messages while calibredb is adding missing books.
Version 1.0.3 -  2016-06-23 New:  Detects Keys for Zotero books that do not exist anywhere in Calibre in the ZKey (#zotero_key) Custom Column, and offers to run calibredb to add them.
Version 1.0.2 -  2016-06-22 Changes for Linux & OSX; New auto-run Validation of Custom Columns after ZMI starts.
Version 1.0.1 -  2016-06-22 Initial release.