Somewhat kludgy changes to make debugging mismatching CGI gid's easier

to figure out.

common.c now sports a global variable running_as_cgi which, when true
causes fatal() to output some mildly more helpful HTML in addition to
the syslog entry.  Since this usually only occurs when the site admin
is installing Mailman, this helpful HTML should give a better clue as
to what's going wrong, rather than an unhelpful Web server message and
syslog entry alone.

Naturally, main() in cgi-wrapper.c sets running_as_cgi to 1; it is
initialized to 0 so as to not upset mail-wrapper.c.

Finally, because I think this is a kludge, I've wrapped this all in an
#ifdef HELPFUL, and set Makefile.in to turn this on by default.  My
thought is that for some future version, if the site admin specifies
--with-cgi-gid to configure, that proves they're somewhat clueful, and
we'd default the HELPFUL macro to "off".

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