caltechlibrary/microarchiver: Release 1.9.0 – PMC output

Summary of changes in this release:

• Now supports output for PMC using new command-line option -s.
• Renamed the JATS XML file after the pattern issn-volume-doi.xml, to make it more compatible with output generated for PMC.
• Removed any alpha channels and convert images to RGB.
• Runs ZIP files through a simple validation step after creating them.
• Added missing dependencies to requirements.txt.
• Some internal code changes.

The file CHANGES contains a more complete change log that includes information about previous releases.