Update to 1.5.4 (ok by wiz@):
        - Documentation updates (STR #4112, STR #4130, STR #4134)
        - Fixes for libusb-based USB backend (STR #4128)
        - The lpq command did not show the owner or title of jobs unless passed
          a username on the command-line (STR #4135)
        - Localized empty strings contained the message catalog metadata
          (STR #4119)
        - Fixed a crash in the libusb-based USB backend (STR #4099)
        - The cups-lpd mini-daemon no longer handled jobs with multiple copies
          (STR #4118)
        - Multiple libusb backend fixes (STR #4098, STR #4100)
        - The IPP backend no longer tries to get the job status for printers
          that do not implement the required operation (STR #4083)
        - Sending a document in an unsupported format to an IPP printer now
          automatically cancels the job (STR #4093)
        - Fix some error reporting issues when printing from /dev/null and
          other unusual situations (STR #4015)
        - The scheduler now sets the CUPS_MAX_MESSAGE environment variable for
          filters (STR #4074)
        - Fixed a build issue when using older versions of autoconf (STR #4084)
        - The IPP backend now treats the client-error-not-possible status code
          as a job history issue, allowing IPP printing to Windows to work
          (STR #4047)
        - The IPP backend incorrectly included the document-format and
          compression attributes in Create-Job requests (STR #4086)
        - The libusb-based USB backend did not work on non-Linux platforms
          (STR #4088)

        - httpReconnect() did not reset the read/write buffers (STR #4065)
        - Compiling without threading support failed (STR #4060)
        - Fixed compile problem with old versions of OpenSSL (STR #4036)
        - The network backends did not check SNMP supply levels regularly
          (STR #4040)
        - The online help always included the "help on help" text (STR #4042)
        - Fixed a SSL handshake issue on OS X (STR #4045)
        - The scheduler could crash if a PPD file contained an invalid paper
          size (STR #4049)
        - The CUPS polling daemon did not reinitialize its connection to the
          remote server on errors in all cases (STR #4031)
        - PostScript auto-configuration was slow and unreliable with some
          printers (STR #4028)
        - Missing localizations caused empty output (STR #4033)
        - The cups-driverd program could temporarily "forget" a PPD file if it
          was updated in place.
        - The dnssd backend now prefers IPPS over IPP.
        - The USB backend now uses and requires LIBUSB 1.0 or later (STR #3477)
        - The LIBUSB-based USB backend now supports the back-channel (STR #2890)
        - Changed how timeouts are implemented in the LPD backend (STR #4013)
        - Added more supported color names for SNMP supplies (STR #3981)
        - The default InputSlot setting was never used (STR #3957)
        - POSIX ACLs are now set properly on certificate files (STR #3970)
        - Supplies with commas in their names were not reported correctly
          (STR #4020)
        - The cupsGetPPD3() function created a temporary file when one was not
          needed (STR #4018)
        - The scheduler now ensures that job notifications contain a value for
          the notify-printer-uri attribute (STR #4014)
        - The lp and lpr commands did not cancel jobs queued from stdin on an
          error (STR #4015)
        - Fixed the IPP backend's handling of HTTP/1.0 compatibility (STR #3988)
        - The IPP backend did not always setup username/password authentication
          for printers (STR #3985)
        - The IPP backend no longer re-queues print jobs that are too large for
          the printer/server (STR #3977)
        - The RPM spec file did not work (STR #4021, STR #4057)
        - Encryption did not work when the server name ended with "."
          (STR #4011)
        - The multi-purpose tray is now mapped to the IPP "by-pass-tray"
          (STR #4009)
        - The correct media size was not always passed to IPP printers
          (STR #4001)
        - Finishing options were not passed to IPP printers (STR #3995)
        - Fixed iCloud-based Back to My Mac printing (STR #3996)

(bouyer)