Move cmdtable and reposetup handling out of extensions.py A new function (extensions.extensions) allows the code that is interested in those attributes to handle them directly. This allows some cleanups of extensions.py. Notably, we can remove the extensions.commandtable hack. It also makes it easier to add standard extension attributes, like a "hgwebsetup" function or a "helptable" dict that augments the data in help.py, etc.

Adjust contrib/hg-ssh for moved dispatch() function.

Merge with crew

verify: report expected linkrev

dispatch: move command dispatching into its own module - move command dispatching functions from commands and cmdutil to dispatch - change findcmd to take a table argument - remove circular import of commands in cmdutil - privatize helper functions in dispatch

move parseurl from cmdutil to hg

fix-up references to repo.RepoError

remove unneeded imports of mdiff

Merge with stable

merge with -stable