Fix for Issue #551.
Fix for Issue #551.

* main.c

  (main): No need to be abort()-ing just because someone got their
  command-line args all messed up.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion