Added banner files (CUPS form XML files)

Added banner files (CUPS form XML files)

Added application/vnd.cups-form MIME type and filter definition.

printable() rule now accepts characters from 128-255 to work with
Microsloth Winblows character sets.

Added initial implementation of form filter for banners, and removed
unneeded source files.

Now look in ~/.cupsrc as well as /etc/cups/client.conf for default
server.

git-svn-id: svn+ssh://src.apple.com/svn/cups/cups.org/trunk@1019 7a7537e8-13f0-0310-91df-b6672ffda945