postreview.py: add separator between commits

Review Request #1465 — Created March 8, 2010 and discarded — Latest diff uploaded

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postreview.py: add separator between commits

When posting a git / git-svn review with --guess-description, add a
separator between commit logs. The separator is a 72-character line of a
user-specified character. The default is empty.
posting this review request :-) (with no separator; also tested specifying separator with a git-svn repo, trying both single-commit and multiple-commit requests)