revset: factorize backup decision The conditional controlling the creation of backup is fairly big. We move config related decisions outside of the loop.

revert: use a flat dispatch table Now that the table is simpler, remove one level of depth from it. This simplifies its usage in the for loop.

pushbookmark: do not attempt to update bookmarks if the push failed (BC) Before this patch, there was always an attempt to update bookmark even if prior steps of the push failed. I cannot see a good semantic reason to do so. We disable this possibility to simplify the push flow with bundle2. Bookmarks will be included in the bundle and fail with other steps.

pushbookmark: remove a <cond> and <val> or <other> construct We make the conditional explicit for the sake of readability.