BTC 0.9.2 batch 6

This brings us on par with Bitcoin Core 0.9.2.1. This should be the final patch set fpr our 1.7.2 release.  
The Gitian deps from 1.7.1 should be reusable by renaming. I need to check the shasums to make sure, but they should match.  
Built and run fine on Ubutnu 12.04, synced to testnet and made a transaction without a problem. Tests pass too.  
This does *not* include the Gitian builds for OS X, which I think would be targeted at 1.8 as it's a rather tedious process to setup and needs a good amount of time to check the process and outputs.