evolve: adapt to change in core rebase Mercurial core changeset 63e889cc610d (And the ones around it) changed the way graft and rebase work. We adapt to them.

test: ignore bytes lenght in message We should be storying floating point number as floating point number. So the size of the meta for fm0 format is going to be unstable. We cover them with a glob.

evolve: adapt to the new metadata storage Metadata are not stored as a "list" of (key, value) tuple instead of a binary blob. This adapt to ef880e28e56a in Mercurial.