Improve xmonad

- add new workspace 0
- add lock
Update PS1 prompt
Vim: remove bepo move keys + set javascript syntax
Git: autosquash

This allow to use git commit --fixup=HEAD^1
and then git rebase -i will be more convenient
Update irssi conf for criteo irc
Add some folder for offlineimap (criteo)
Stuff for conkeror config (stolen keys)

The main thing to fix was google and github.
For google there is a parameter in google account to avoid instant
search.
For github: don't know yet how to fix it
Improve mutt handling for alternate addresses