Updated submodules
Faster detection of stgit and bazaar
Further status speed up: don't call hg
Fix vcs_info

Way of finding repository top level directory worked only for git.
Otherwise current working directory was not properly restored when
reaching /, thus finding repository root for bzr never worked.
Replace call to bzr nick

Use python function to read relevant data. This will not work for
colocated branches right now, but is still 3x faster than running bzr
nick.
Skip calling git as well

Another speed up.
Skip calling stg as well

Now getting all information is blazingly fast.
Add vcs-info version written in racket
Ignore racket compiled directory
Emacs configuration update
Merge branch 'vcs-racket'
Fixed stg handling in Python version

When branch is not initialised, there's not corresponding patch
directory.
Use racket vcs-info if racket is available
vcs-info: small structural improvement wrt. assq
Update emacs config