merge: don't report progress for dr/rd actions It is easier to reason about certain algorithms in terms of a file->action mapping than the current action->list-of-files. Bid merge is already written this way (but with a list of actions per file), and largefiles' overridecalculateupdates() will also benefit. However, that requires us to have at most one action per file. That requirement is currently violated by 'dr' (divergent rename) and 'rd' (rename and delete) actions, which can exist for the same file as some other action. These actions are only used for displaying warnings to the user; they don't change anything in the working copy or the dirstate. In this way, they are similar to the 'k' (keep) action. However, they are even less action-like than 'k' is: 'k' at least describes what to do with the file ("do nothing"), while 'dr' and 'rd' or only annotations for files for which there may exist other, "real" actions. As a first step towards separating these acitons out, stop including them in the progress output, just like we already exclude the 'k' action.

subrepo: add partial diff support for git subrepos So far, git subrepositories were silently ignored for diffs. This patch adds support for git subrepositories, with the remark that --include and --exclude are not supported. If --include or --exclude are used, the subrepo is ignored.

subrepo: extend git version check to 3 digits This allows more flexibility when a version check is required. Some git features are introduced in a version where only the 3rd digit changes.

subrepo: move git version check into a separate method This allows checking the git version in other methods, instead of only being able to check if the version is ok or not.

rebase: show a note for updated mq patches It deserves more than a debug message. Show a note like: updating mq patch p0.patch to 5:9ecc820b1737 The message could also refer to "qrefresh" instead. Same same.

rebase: improve debug messages while processing the list of rebases

rebase: show warning when rebase creates no changes to commit Similar to graft: note: rebase of 6:eea13746799a created no changes to commit

rebase: show more useful status information while rebasing Show status messages while rebasing, similar to what graft do: rebasing 12:2647734878ef "fork" (tip) This gives more context for the user when resolving conflicts.

tests: make 'saved backup' globbing less narrow in rebase tests Globbing the hash made it harder to maintain tests with run-tests -i when it was so far by the generated test output. The hashes are stable and we just need to add a (glob).

tests: stabilise mq rebase tests Prepare for including hashes in output ... and less globbing make the tests easier to update.

test-graft: use strip extension instead of mq extension It only needs strip, no reason to load all of mq.

transaction: remove the 'onabort' mechanism It has no known users. If someones needs similar functionality, a new 'addabort' method similar to 'addfinalize' should be added.