Changed global load balancing to require only a single iteration - still buggy though
default send for assert=yes is now mpi_issend, added minimum load to avoid problems with empty load, still not working though in case of exact matches
Load balancing: All load computation is done in integer arithmetics now, pure MPI appears to work, OpenMP crashes
Load balancing: Fixed OpenMP parallelization
Merge pull request #1 from meistero/global_lb

Global Load Balancing
Fixed a small bug in node traversal: min depth, max depth and sections per thread were initialized here which must happen before
Changed minor detail to load balancing: in order to avoid zero load, we compute l <- max(1, l) instead of l <- 1 + l, which gives a more accurate value
Changed plot scripts for better visiblity
Merged PyOP2 branch: added a generic C++ interface
Merge pull request #3 from meistero/master

PyOP2 branch