Several important changes.

1. For mail-wrapper.c and cgi-wrapper.c, most common routines have
   been moved to common.c.  While there were some differences in the
   way these two wrappers worked (most notably in the error handling
   and reporting when UID's and GID's didn't match), they were easily
   merged.  Fatal errors now always syslog and exit(1).

2. The exec*() call for running the new process has been changed and
   made consistent.  For improved security, the absolute path to the
   Python interpreter (as discovered by configure) is compiled into
   these programs, and the environment variable PYTHONPATH is set to
   include only the absolute path the the installed Mailman package
   ($prefix/Mailman).  Scripts are invoked by exec'ing the Python
   interpreter with the first argument being the absolute path to the
   script to run, along with any additional arguments on argc/argv.

   See the function run_script() in common.c for details.

3. alias-wrapper.c has not yet been fully merged.  I gathered from Ken
   that it doesn't work completely well anyway.

4. check_caller() in common.c still checks the gid, but as we
   discussed before, this may be redundant.  I wanted one check-in
   with a history of this feature first though.

5. Added an Emacs turd at the end of all files so that the C code will
   be edited using Python's standard C style.  Reformatted existing
   code.

6. Removed pseudo-log history from comments at top of files.

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