cups-filters 1.28.4 released!

Bug fix release, mainly to solve CUPS performance problems caused by the IPP fax support of the "driverless" utility

• driverless: Avoid duplicate PPD list entries from the same device via UUID
• driverless: Reduce ippfind calls by "driverless" and "driverless-fax"called by CUPS. Let "driverless list" list both print and fax PPDs and "driverless-fax list" do nothing.
• driverless: Avoid duplicate listings in printer discovery, by "driverless-fax" not listing any URI as "driverless" lists them all already.
• driverless: Vastly improve performance by doing only one ippfind call instead of two (IPP, IPPS) as ippfind accepts more than one reg type on the command line.
• Sample PPDs: Corrected manufacturer name in Fuji_Xerox-DocuPrint_CM305_df-PDF.ppd.

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