.ParseMailCommands(): Escape the list real_name that's interpolated

into the confimation-expression pattern, to prevent regex-significant
characters in maillist names from tripping-up the regex compiler.
This really can happen - in fact, it does when people try to subscribe
to the "c++-sig"!

(I've cursorily checked through the python stuff in scripts, Mailman,
and Mailman/Cgi for other interpolations that might trip re.compile,
but didn't find any other instances.  Be on the lookout, though, this
is a tricky one...)

(This was present in 1.0b4, as well, and i believe it accounts for two
elusive, outstanding problems:

 - the "pcre.error :  ('nothing to repeat', 2)" traceback, which i
   mentioned on my recent "problems" list, and
 - reports i've gotten (one this morning, coincidentally) of failures
   in subscribing to c++-sig.)

I'm going to deliver a patch for 1.0b4 to the newsgroup, once i track
down a few other problems.)

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