log4j upgrade?

[Anil Gangolli]

Log4j is up to 1.2.12.  We're still using/distributing 1.2.4 in the 
trunk (bound for 2.0).  I think we should upgrade to 1.2.12 in the trunk.

May want to look at some of our other dependencies as well before 2.0 
goes out.

--a.