Generalized compression method enable/disable. Now any method can be
removed. Applications can call NuTestFeature() to figure out what is
supported by the copy of NufxLib they're linked against.
is in the process of compressing the data. By writing to an AppleTalk
network and copying the archive while it was being written, I wound up
with an archive that appeared complete but was actually truncated. We
now try to detect that case, and the compression code will spit back an
error instead of an assertion failure.