libcupsfilters 2.0b3

[tillkamppeter]

Fixes of bugs found while packaging for distros, mainly in the build system and the source code documentation

• cfFilterGhostscript(): Select correct ICC profile for PCL-XL. When using the cfFilterGhostscript() filter function to generate PCL-XL (PXL, PCL 6, Ghostscript output devices "pxlmono", "pxlcolor") output, always the color IPP profile srgb.c was used, also for monochrome output ("pxlmono") and this makes Ghostscript error out. Now we correctly select sgray.icc for monochrome output.
• cfGetPrinterAttributes(): Poll media-col-database separately if needed.
  Some printers are not able to handle a get-printer-attributes request querying both the all group attribute and the media-col-database attribute, so query the latter with a separate call in such cases.
• cfGenerateSizes(): Also parse the media-col-ready IPP attribute for page sizes and margins. This often reveals extra margin variants, like borderless.
• Removed public cfPDFOut...() API (cupsfilters/pdfutils.h). This API only makes sense if the API of fontembed is also public, but this we made private earlier.
• Build system, README.md: Remove unnecessary dependencies overlooked during the separation: zlib (only needed by libppd), Freetype (not needed any more after removal of pdftoopvp), Avahi and GLib (both only needed by cups-browsed). Thanks a lot, Zdenek Dohnal (Pull request Remove unused dependencies #7).
• COPYING, NOTICE: Simplification for autotools-generated files.
  autotools-generated files can be included under the license of the upstream code, and FSF copyright added to upstream copyright list. Simplified COPYING appropriately.
• COPYING, NOTICE: Added copyright year 2023
• COPYING, NOTICE, AUTHORS: Added Jai Luthra and Vikrant Malik
• Makefile.am: Include LICENSE in distribution tarball

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This discussion was created from the release libcupsfilters 2.0b3.