tg: you will want to switch to a different branch.
$ ..resolve..
$ git commit
+ $ tg create
tg: Resuming t/whatever setup...
- $ tg create t/whatever
$ ..hack..
$ git commit
'D' marks that it is out-of-date wrt. its dependencies,
'B' marks that it is out-of-date wrt. its base).
+ TODO: Speed up by an order of magnitude
+ TODO: Graph view
+
tg update
~~~~~~~~~
Update the current topic branch wrt. changes in the branches
TODO: Some infrastructure for sharing topic branches between
repositories easily
+TODO: tg depend for adding/removing dependencies smoothly
IMPLEMENTATION