#111 Data-fork resource files

[James W. Walker]

When I checked in a data-fork resource file, a resource fork
with a 'ckid' resource was added, which made the file
unusable. Perhaps this wouldn't have happened if the file
mapping for .rsrc had been binary rather than AppleSingle,
but then that would screw up my other resource files with
that extension. I can't use a different extension on the data-
fork resource file, because the file name "Localized.rsrc" has
a special meaning for OS X.

[Glenn L. Austin]

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I've got basic data-fork resource file management in the code, I just
need to resolve a -49 error before submitting it.