        Our sophisticated integrated help facility.  Mostly duplicates
        what is below:

         # to list commands:
         $ tg help
         # to get help for a particular command:
         $ tg help <command>
         # to get help for a particular command in a browser window:
         $ tg help -w <command>
         # to get help on TopGit itself
         $ tg help tg
         # to get help on TopGit itself in a browser
         $ tg help -w tg

