Merge branch 'ld/p4-changes-block-size'

More Perforce row number limit workaround for "git p4".

* ld/p4-changes-block-size:
  git-p4: fixing --changes-block-size handling
  git-p4: add tests for non-numeric revision range
  git-p4: test with limited p4 server results
  git-p4: additional testing of --changes-block-size

diff --cc git-p4.py
Simple merge