I've committed a few changes for handing images with regard to PML input.
PMLZ can have images in ./ (top level), in archivename_img/, or images/ directories within the archive.
PML can have images in bookname_img/ or images/ directories that are in the same location as the PML file.
One thing to note is the first location in the above order that contains PNG files will be the only location used. Also, bookname in bookname_img is the name of name of the PML file without the extension not the name set in the metadata.
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