Allow for a script to be executed when an account is purged

[GoogleCodeExporter]

Similarly to how it is possible to run a script for the homedir creation 
helper, it would be nice to be 
able to run a script to do extra cleanup when an account is purged. This would 
aid in, for example, 
removing Apache configs generated by a homedir creator that makes Apache 
configuration files for 
each user on a WebDAV file server.

Original issue reported on code.google.com by nick.bar...@gmail.com on 19 Dec 2008 at 1:16