run-tests: move _executetests into TestSuite

run-tests: capture execution times in TestResult TestResult has facilities for recording when tests start and stop. It makes sense to move execution time recording into TestResult. In addition, output generation is being moved into TestResult, a class that has a concept of an output buffer (and a lock).

run-tests: move outputtimes() into unittest runner class The unittest runner now does all the printing. Move outputtimes() there.

run-tests: refactor how times are recorded We now record times in Test.run(), which is a more appropriate place for it.

run-tests: eliminate Test._result The result of test execution is now reported on a TestResult. We no longer need to store a tuple of the result.

run-tests: replace Test.ignore() with raise IgnoreTest

run-tests: replace Test.skip() with raise SkipTest All the result functions now raise an Exception. We no longer need these functions and we can inline the raise.

run-tests: remove some legacy code around result handling unittest handles all results now. We no longer need to manually keep track of results.

run-tests: merge MercurialTest into Test Now that we execute all tests via unittest, the MercurialTest wrapper is not necessary. This patches moves the logic from MercurialTest into Test and makes Test a child of unittest.TestCase.

check-code: check for consistent usage of the websub filter in hgweb templates The check-code tool now expects the "desc" keyword to be followed by the "websub" filter, with the following exceptions: a) It has no filters at all, e.g. a changeset description in the raw style templates or the repository description in the summary page. b) It is followed by the "firstline" filter, e.g. the first line of the changeset description is displayed as a summary or title.