Moving record into core

[Dirkjan Ochtman]

I think it's high time.

Game plan:

- move hgext/record.py to mercurial/record.py
- add -i/--interactive options to commit and qnew
- add internal aliases for record and qrecord, to save the old-timers pain

I'd like to take a more thorough look at the code after that and see
if it can be cleaned up. Maybe we can split it up, some parts in
patch.py, some parts in cmdutil? We should also look at doing revert
-i, maybe qref -i, etc.

Cheers,

Dirkjan