Part of Guy Harris' Jan-93 rewrite, including:

Part of Guy Harris' Jan-93 rewrite, including:
Note that "short", "long", and "date" work in the native byte
order of the process running "file" (actually, I say "this
machine", but I could imagine UNIX on MIPS chips supporting both
big-endian and little-endian processes), and document "beshort",
"belong", "bedate", "leshort", "lelong", and "ledate".

Document old-style ANDing, now that it works.

Formatting nits.

Mention that ">\0" can be used to match any string, and thus to
print strings extracted from the file.

Document multi-level ">".

Document that I haven't yet implemented ways of specifying the
endianness of data to be used in indirect offsets.