- now passes all tests using the p4 api library.
(still not default, set env var VCPP4API=1)
- foo->p4 handles branch-but-no-change case when
--change-branch-rev-1 is passed.
- sources & dests can now provide their own command
execution routine in place of shelling out to an
external command (as in call the p4api library
instead of running the p4 command).