The ability to change root dirs is needed for 0.26, so people with existing root dir sutures can migrate.

There is a branch for this: net.venge.monotone.root-dir-rename

The branch has:

• rosters have the ability to change roots
• roster_merge handles the new conflict cases this allows

The branch needs:

• an implementation of pivot_root
  • NB: make sure to refuse to pivot_root if the proposed new root has a subdir named "MT"
• lots of tests
  • make the roster.cc test automaton generate root dir stuff
  • roster_merge stuff
  • pivot_root stuff
  • rosterify on db with root sutures
  • ?