Remove unused test files.
Moved verify_owner to P4 class. General cleanup also.
Hooked up --debug option and removed need to set options.changenum.
Cleaned up comments, doc strings and formatting.
Don't migrate .rbrc before parsing options.

If someone just runs the script to get usage, don't bother migrating their options.
Fixed messages on submit with shelved files and no ship its.
Use modern with open() as f idiom.

We don't need to support python 2.4, so we can use the better idiom
for processing a file.
Use separate function to pass options to postreview.
Undid the last change - it was not needed.