merge: update comment for future devs

obsolete: clarify documentation for succcessorssets

backout: add a message after backout that need manual commit In some case Backout silently succeeded to back out but left all the change uncommitted. This may be confusing for user so this changeset add a note reminding to commit. Other backout case already actively informs the user about created commit.

backout: avoid update on simple case. Before the changeset the backout process was: 1) go to <target> 2) revert to <target> parent 3) update back to changeset we came from The two update steps can takes a very long time to move back and forth unrelated file change between <target> and current working directory. The new process is just merging current working directory with the parent of <target> using <target> as ancestor. This give the very same result but skip the two updates. On big repo with a lot of files and changes that save a lots of time (x20 for one week window). The "merge" version (hg backout --merge) is still done with upgrades. We could imagine using in memory commit to speed it up but this is another fish.

run-tests: print more information on unnecessary glob matching Extend the message with the test name and the approximate line number. (The line number is the one of the command producing the output.) Finding the line to fix is easier now. old message: ...... Info, unnecessary glob: at a/b/c (glob) .. new message: ...... Info, unnecessary glob in test-example.t (after line 9): at a/b/c (glob) .. The test result is still pass as before.

run-tests: suggest to append glob when only path sep does not match When the line does not match because of \ instead of / (on windows), append (glob) in the expected output. This allows to rename test-bla.t.err to test-bla.t for getting a correct output. This worked for other failures like missing (esc), but not here. Output example (only +- lines of diff): Before: - path/with/local/sep + path\\with\\local/sep Now: - path/with/local/sep + path/with/local/sep (glob)

run-tests: test each line matching function on its own This has several advantages. * Each match function can return some information to the caller runone (used in the next patch). * It is not checked that the line ends in " (glob)" when rematch() returns false. * And it looks more readable.