[Xmonad] darcs patch: New features for generate-configs.sh; renamed to generate-configs

[Don Stewart]

alextarkovsky:
> As discussed in the previous thread generate-configs.sh needed some
> usability improvements, so I've implemented them in this patch as new
> command line options:
> 
> * --main specifies the path to the main repository (required)
> 
> * --contrib specifies the path to the contrib repository (required)
> 
> * --output specifies a different output directory than the default which
> is taken from the value of --contrib (optional)
> 
> * --active tells the script to insert the config data as live code
> instead of the default commented out code (optional)
> 
> And don't forget --help. ;)
> 
> I also renamed the script to simply "generate-configs" because the ".sh"
> was becoming obnoxious.
> 
> -- 
> Alex Tarkovsky

Applied.