changegroup: roll changegroup.collector into lookup functions

changegroup: add revlog to the group callback

changegroup: move sorting down into group

changegroup: fold progress meter into callbacks progress meters now start at 1 rather than 0

changegroup: combine infocollect and lookup callbacks

changegroup: drop unused fullrev This is unfinished and unused and complicates expanding the wire protocol.

util: dates cannot consist entirely of whitespace (issue2732)

convert/mtn: convert suspended branches as closed branches Monotone treats branch closing ("suspending") in a similar manner to how we do in mercurial - a cert is added to a revision that marks the branch to be hidden. If a subsequent commit is made, the branch is effectively reopened.