adding ifHCInUcastPkts/ifHCOut

also adding Broadcast and Multicast, but not graphing them because they
weren't graphed before.

I changed this version to use a different group so things won't break
for people using storeByGroup.  A moose once bit my sister.  That means I had to monkey with a bunch of files though.  I also noticed in my previous commit I had changed one of the test directories instead of the live mib2.xml, so it wouldn't have worked anyway. 

We would like you to know that the developers responsible for the previous pull request comments have been sacked.