CHANGES IN V1.28.17
+ - libcupsfilters: In PPD generator create only one *cupsFilter2:
+ line for raster. Only use the most desirable/reliable format,
+ usually Apple Raster.
+ - libcupsfilters: In get_printer_attributes() poll
+ "media-col-database" separately if needed. On some printers
+ one gets "media-col-database" only this way. Ofte reveals
+ important functionality, like for example borderless
+ printing.
+ - 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 usefull when
+ "media-col-database" is not available.
- 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