Get rid of superfluous recompute_degrees - already done when running make_simple
all shortest paths now calls single shortest path, single shortest path now actually passes back the computed value by reference and starts with the correct source node
minor edits
Update lib_graphd/test/Makefile to build using same options as libgraphd.a (otherwise OpenMP breaks);  updated run_test script to warn on binaries that didn't get built
Merge remote branch 'upstream/master'
minor edits
shortest_path all now calls single path; single path now correctly populates/returns the shortest path values and starts from the correct source node; removed excess print statements