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amend: add obsolete support If the obsolete feature is enabled, `hg commit --amend` marks a changeset as obsolete instead of stripping it.

obsolete: add a high level function to create an obsolete marker This function is designed to be used by all code that creates new obsolete markers in the local repository. It is not used by debugobsolete because debugobsolete allows the use of an unknown hash as argument.

amend: use an explicit commit message for temporary amending commit Before this changeset, the extra commit created during amend had the same description as the final commit. This was a bit confusing when trying to understand what that extra commit was about. This changeset changes the description of such commit to: temporary amend commit for <ammend-commit-hash> The old behaviour was not a big deal, but would become more confusing once we use obsolescence marker instead of stripping the precursors. This also helps if the user restores a strip backup.

amend: wrap all commit operations in a single transaction This allows proper recovery of an interrupted amend process. No changes are made to the logic besides: - indent operations into a single try-except clause, - some comment and code wrapping to 80 chars, - strip logic should not be contained in the transaction and is extracted from the main code.

amend: lock the repository during the whole process Without this changes another writer can lock the repository in the middle the amend process. The resulting mess can be pretty ugly.

Merge with crew