This handles version 1 and 2, and copes with the broken files
created by the Mac OS X "applesingle" command-line tool (which is
unable to decode the broken files it creates).
I get the sense that many AppleSingle files don't end with ".AS", so
the filespec includes "*.*" as well.
Some AppleSingle files don't include a filename. In that case, we
use the file's name as the entry name, minus any ".as" extension.
The current implementation doesn't convert from Unicode to Mac OS
Roman, so non-ASCII characters are mishandled unless the file was
generated by GS/ShrinkIt. (We assume version 1 AppleSingle files
use MOR name strings.)
Also, version bump to 4.0.0d3.
