Clean up some python scripts, and add some new ones, by moving common
functionality into a new python 'blindrut' package. Add unit testing with
doctests using the py.test framework as well.
Rename script, since I keep typing the longer version anyway.
Automatically mark read-only files as non-modifiable too.
Add / when autocompleting symlinks to directories.
Also support running the programs these aliases were named after.
Use readable background colour when listing world-writable files.

The default is black on dark-green.
Merge random disconnected changeset.
Upgrade to TeX Live 2013.
Misc filetype updates.