hgweb: run search instead of showing wrong error for ambigious identifier
Before this when multiple changesets hashes in the repos started with the
search query string, error was given that the revision isn't found, and it
was misleading. Now a simple keyword search runs in this case.
To run the tests, do:
cd tests/
python run-tests.py
See http://mercurial.selenic.com/wiki/WritingTests for
more information on writing tests.