formatter: add json formatter

cmdutil: add json style to log-like commands Sadly, this can't be done with the normal templater like we do with XML due to JSON's inter-record comma rules.

encoding: add json escaping filter This ends up here because it needs to be somewhat encoding aware.

encoding: handle empty string in toutf8

formatter: make debug style match Python syntax

files: add new command unifying locate and manifest functionality

filelog: parsemeta stops returning unused key list Currently, only the returned meta dictionary is used. An upcoming change will use the returned text offset.

filelog: make parsemeta a public module function, to be used by censor module

filelog: make packmeta a public module function, to be used by censor

ui: move samplehgrcs from config config is generic code that doesn't know about Mercurial usage, so this was at the wrong layer

config: normalize style between user/global example configs

commit: correctly check commit mutability during commit --amend The right way to check if a context is mutable is to call .mutable(), not to compare .phase() with public.

histedit: check mutability of contexts correctly The right way to check if a context is mutable is to call .mutable(), not to compare .phase() with public.

manifest: mark addlistdelta and checkforbidden as module-private

convert: enable deterministic conversion progress bar for svn This produces slightly bad results when branches are in play, but overall I think it's probably worthwhile. We might be able to do better with branches somehow, but I haven't given it any thought.