Old users

Whlist restoring user accounts to our test cluster I had a quick look to see when everyone had last logged on.

2005 x 1
2006 x 4
2007 x 20
2008 x 4
2009 x 7
2010 x 11
2011 ...

We should proabably automatically lock accounts after a while. It's not like at a company where you can delete users when they leave because our users don't all work at VT. We have no way of really knowing when they are done with the account unless they let us know. I think 6 months before getting locked out sounds sane.