tests: improve hghave error reporting for missing Py OpenSSL

Merge with stable

Improve unresolved merge conflicts warning (issue2681) Suggested by Antoine Pitrou <pitrou@free.fr>

tests: convert test-serve to new format

run-tests: handle mixed comment lines in blacklists

test-doctest: handle unix/windows path discrepancies

test-rename-merge1: make it easier to review, windows friendly - Reuse the coding style of the previous tests, both are very similar - Do not play with case changes, it does not work on Windows

merge: drop resolve state for mergers with identical contents (issue2680)

merge with stable

match: ignore "" patterns The following command would visit every changeset in repo/ rather than the last 10: hg log -l 10 repo/