colocated branches and auto nicknaming may solve merge&push problem.

[INADA Naoki]

Thank you, Stephen.

Git doesn't care about "left" revision so bzr should solve it original way.

After some consideration, I think adding option to commit like "bzr
commit --land=1"
is better than adding option to merge. (1 means pending:1, 0 means current head,
--land without argument means --land=1)

If adding --land option to merge, make "bzr revert" well is hard.
And we should make an way to change "left" revision after merging.

-- 
INADA Naoki  <songofacandy at gmail.com>