revlog: slightly tune group() by not going rev->node->rev

drop unused imports

indentation cleanup

test-debugcomplete: add --show merge option to output

merge: add -S/--show option to review revisions without merging

inotify: Abstract the layer format and sizes to a inotify.common dictionary Instead of having a single possible request format, introduce a dictionary of possible messages in inotify.common

inotify: Coding Style: name classes in lowercase.