Add (very) preliminary BASH-support, fix XMonad

BASH:
- Adds support for generating bash_aliases from bash_aliases_template
  (new file); this intermediate step is required, so that my_cloc can
  be properly aliased

XMonad:
- Adds LANGUAGE-pragma, to fix compilation error

- Simplifies screen-lock command

- Changes screenshot-utility to 'scrot', which seems more reliable

MISC:
- Gets latest version of 'cloc'-script from SourceForge (since e.g.
  Ubuntu provides a version which is too old).