threads by giving them an empty data fork (and, if it's an extended
file, an empty resource fork). This allows applications to simply
ignore the bogus records and let NufxLib do the dirty work.
Fixed dataless thread handling for the original (non-masked) case. We
weren't creating empty resource forks when required, so a dataless
record with a forked-file storage type wouldn't be recreated properly
if extracted and then added.
Added version numbers to the public header, so applications can test
for "compiled" version vs "linked" version.
