tests: teach f not to report symlink mode bits They're not meaningful or portable

tests: teach f not to report directory size It's not meaningful or portable

test-histedit-commute: call helper script with sh Buildbot pointed out that this test wasn't passing on Linux+vfat because there's no chmod for shell scripts.

test-tools: fix portability issues

progress: add a lock to prepare for introducing a thread

progress: move update check into helper method

progress: move current topic to member variable

progress: add try/finally to make the diffs for the next commit more readable No change in behavior.

transaction: include backup file in the "undo" transaction Once the transaction is closed, we now write transaction related data for possible future undo. For now, we only do it for full file "backup" because their were not handle at all in that case. In the future, we could move all the current logic to set undo up (that currently exists in localrepository) inside transaction itself, but it is not strictly requires to solve the current situation.

transaction: pass the name of the "undo" journal to the transaction It is time for the transaction to be responsible for setting up the undo data. It is necessary to move this logic into the transaction because many more files are handled now, and the transaction is the object tracking them all. The value can be set to None if no undo should be set.