Since r7265, a user could not launch a PuTTY session to a specific host by

Since r7265, a user could not launch a PuTTY session to a specific host by
simply specifying a hostname on the command line -- this would bring up the
config dialog. Use a slightly more sophisticated notion of whether the user
meant to launch a session.

git-svn-id: svn://svn.tartarus.org/sgt/putty@7321 cda61777-01e9-0310-a592-d414129be87e