New yum module: grouppackagetypes

Hi all,

I was trying to find out how I could install just the mandatory packages 
from a package group when using "yum groupinstall ...". I found that I 
could add a line to /etc/yum.conf:

group_package_types=mandatory

But I'd like to be able to do it from the command line, i.e. without 
editing any files, then having to edit them back. So, I asked on the 
#yum IRC channel and it was suggested that I could do this with a yum 
plugin.

So, not letting the small matter that I don't really know any python get 
in the way, I came up with this:

     http://robinbowes.com/projects/yum-grouppackagetypes

Hope someone else finds it useful.

R.