Save work on transcoding PPD text strings from the PPD encoding to

Save work on transcoding PPD text strings from the PPD encoding to
UTF-8 (STR #1475)

cups/ppd.c:
    - ppdOpen2(): Add calls to cupsCharsetToUTF8 and
      ppd_get_encoding.
    - ppd_get_encoding(): Added.
    - ppd_get_group(): Added encoding argument, call
      cupsCharsetToUTF8().

scheduler/printers.c:
    - cupsdSetPrinterAttrs(): Use ppd->nickname directly since it is
      transcoded for us now in ppdOpen2().
    - transcode_nickname(): Removed.

git-svn-id: svn+ssh://src.apple.com/svn/cups/cups.org/trunk@5292 7a7537e8-13f0-0310-91df-b6672ffda945