add a small test for contrib/check-code.py This changeset adds a test file for contrib/check-code.py. This test runs check-code.py against two small files. The first file should not raise any check-code.py error while the second should. A line contains multiple errors to verify the check-code.py behaviour: In the case of multiple errors at the same line, the context line should only be displayed once.

keyword: do not bother about detecting extension path in demo Detecting and showing the path to a keyword extension in a non-standard place only made sense while keyword.py was not shipped with Mercurial. The test output has changed because we do not have a spurious space at eol anymore.