Initial commit - xkcd-background.py

First version of xkcd-background.py
Rewritten from a very ugly shell script
Clarification regarding screen(height,width)
Refactor top/bottom border a bit
Comment
xkcd-background.py: Change default destination location
xkcd-background.py: Check that we actually got a comic
xkcd-background.py: Leave a bit of space on the sides
xkcd-background.py: Change from daemon to script
xkcd-background.py: Unbreak, throw error and exit if no comic is found
xkcd-background.py: Be more verbose about creating directories
xkcd-background.py: Unbreak urlopen wrapper

This was retrying forever, flooding logfiles.
Also makes the code simpler.
This probably removes all daemonisms.
xkcd_background.py: Unbreak the urlopen wrapper, add some exit codes

Signed-off-by: Benedikt Morbach <benedikt.morbach@googlemail.com>
xkcd_background.py: More work
exrebase: automagically rebase your working copy of repos
xkcd_background: rename function
xkcd_background: rewrite
exrebase: update path
exrebase: change diff
add check_slots
check_slots: Add note about this needing paludis-scm