Some fixes to the Mac OS X build:
- Replace the Carbon calls that were used to set the creator
and file type with xattr calls. The Carbon stuff still worked
but caused deprecation warnings. Stop linking against Carbon.
- Correct the way resource forks are accessed (from "/rsrc" to
"/..namedfork/rsrc"). The native resource fork support is
incomplete and doesn't work quite right, so it's now disabled.
(Which means the corrections to the file name don't actually do
anything, but you can at least play with it.)
- Correct the file/aux type conversion, which appeared to do
useful things but actually didn't in some circumstances (e.g. when
adding files, the code for acquiring the file types needs to be in
NuLib2, not NufxLib).
- Set creator and file type to 'pdos' values when extracting from
a Binary ][ archive.
Also, drop some old purify/quantify stuff.
