ppdOpen2() now converts the NickName and all UI text to UTF-8

ppdOpen2() now converts the NickName and all UI text to UTF-8
(STR #1475)

Simplify test framework.

cups/ppd.c:
    - ppdOpen2(): Set lang_encoding to "UTF-8" and convert all
      UI text to UTF-8.
    - ppd_get_group(): Convert text to UTF-8.

cups/testi18n.c:
    - main(): Simplify.
    - print_synopsis(): Removed.
    - test_transcode(): Use common output format.
    - test_normalize(): Comment out until we revamp.

cups/transcode.c:
    - Revamp whole file to conform to CMP, cleanup
      logic/unnecessary code, and support beyond plane 0.
    - cupsUTF16ToUTF32(): Removed.
    - cupsUTF32ToUTF16(): Removed.
    - cupsUTF16ToUTF8(): Removed.
    - cupsUTF8ToUTF16(): Removed.

cups/transcode.h:
    - cupsUTF16ToUTF32(): Removed.
    - cupsUTF32ToUTF16(): Removed.
    - cupsUTF16ToUTF8(): Removed.
    - cupsUTF8ToUTF16(): Removed.

git-svn-id: svn+ssh://src.apple.com/svn/cups/cups.org/trunk@5293 7a7537e8-13f0-0310-91df-b6672ffda945