Have begun transitioning messages to use protocol buffers instead of just pickling.
Switched message for notification of peered message response over to protocol buffer.
Still transitioning messages to use protocol buffers.  This commit is the first part of updating sequence block requests.  Still need to create a submessage from getting variable store deltas.
Using protocol buffers for serialization and deserialization.  Also,
only updating other sides with deltas rather than full re-writes
whenever peered data change.
Switched partner notified of peered change messages over to protocol buffers.
Had some unresolved bugs handling variable store deltas (see previous commit).  This commit should handle them and assure that all unit tests are passing.