Change 3402

Barrie Slaymaker
Request Review
- 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).
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