- made generic method for deprecating cert_path, etc.

- made generic method for deprecating cert_path, etc.
- doc'd vendor() and partner() as deprecated but will not put out
  warnings on those for now (B::OP new() behavior would make this annoying)
- shortened code for the custom methods (we are not using build_subs())
- now using path() again as "/commit" is not needed/used by PayflowPro HTTPS
- removed code in submit() related to "/commit" that is no longer needed
- set param("test_server") so the test server name can be changed