-Changed convention of node ownership so that co-located nodes are on the same processor.
-Added _owner to make future send/receives of boundary nodes easier.
-use MPI to develop and share _owner, and use assert to make sure it's all right.
-Placed domain decomposition stuff in it's own method.
-Updated makefile to show optional warnings.
-Updated goals in readme
-Added a bunch of synchronizing barriers
-Limited a lot of plotting and file-making to the 0-processor