Rewrote p4_change_is_shelved to be more concise.
Some cleanup

* Comment out functions I don't think I need. If my tests don't blow up I can delete them.
* Add some user friendly messages.
* If edit --status option used, do that and exit.

TODO: Fix the edit --status function.
Be able to reopen review. Add --debug option.
Fix the function to retrieve list of reviewers.
Remove help on commands we're not supporting.
Remove commented out help string. Improved comment for 401 error.
Add new usage() function that matches the python version.
Remove the summary message from create.

Let the do_rr_edit() function print the informational messages instead
of having it in both edit and create.
Delete old reference script.