New ECAL Unpacker code , off in sequences for the time being

New Ecalunpacker module from Philippe Gras. Not used in standard sequences for this PR. We plan to activate it at a later time.
gettimeofday isn't particularly fast. I would think it would be better to just use the timing systems of the framework or the Timer service. Baring that, I've been suggesting that people use the new C++11 chrono facility.