cups-filters 1.28.17 released!

Bug fix release, to more reliably discover all printer capablities from driverless printers, especially borderless printing, and to preferably use Apple Raster instead of PWG Raster or PCLM.

• libcupsfilters: In PPD generator create only one *cupsFilter2: line for raster. Only use the most desirable/reliable format, usually Apple Raster (Issue #498).
• libcupsfilters: In get_printer_attributes() poll media-col-database separately if needed. On some printers one gets media-col-database only this way. Often it reveals important functionality, like for example borderless printing (Issue #492).
• libcupsfilters: Let PPD generator also parse media-col-ready IPP attribute. media-col-ready lists the loaded media, in contrary to media-ready, as list of complete descriptions of the media (media-col data structure). This often lists also variants like borderless (it is the same physical paper). Especially useful when media-col-database is not available (Issue #492).
• libcupsfilters: In generate_sizes() consider all margin alternatives. When generating the PPD file for a driverless printer, and in the media-{left,right,top,bottom}-margin-supported printer IPP attributes there was more than 1 value, the first value (which often was the 0 for borderless printing) was not considered, leaving the borderless functionality of many printers undiscovered (Issue #492).

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