Raw printing with queues pointing to the file pseudo- device and

Raw printing with queues pointing to the file pseudo- device and
multiple files and/or banners now works (STR #1933)

filter/gziptoany.c:
    - main(): Use cupsFile API instead of gzip API, and look for the
      FINAL_CONTENT_TYPE environment variable to determine whether
      copies need to be generated.

scheduler/job.c:
    - start_job(): Add gziptoany filter for raw jobs and drop raw
      printing to file device prohibition.

git-svn-id: svn+ssh://src.apple.com/svn/cups/cups.org/trunk@6375 7a7537e8-13f0-0310-91df-b6672ffda945