When I added my --enable-masquerade option, you'll note that I didn't make it

When I added my --enable-masquerade option, you'll note that I didn't make it
--enable-nmh-masquerade.  I find the --enable-nmh-* options too wordy and I'm
not sure why Richard went that route.  I've renamed them to just --enable-*, but
the old versions will still work as well (they just aren't advertised).

Added a line to the "nmh configuration" output saying whether POP is enabled.