post-review: Support older p4d, pending changelists

Review Request #1031 — Created Sept. 9, 2009 and submitted — Latest diff uploaded

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RBTools

Reviewers

This fixes post-review to work on older p4d (which I am stuck with at $DAYJOB); without this change post-review can only be used on submitted changelists. This also adds support for the default changelist (for all p4/p4d versions).

See also http://reviews.review-board.org/r/804/ (replacing the diffs there failed, hence the new request).