nifstd_tools.simplify.simplify fix for multi-path case
nifstd_tools.simplify.simplify fix for multi-path case

networkx pulls in paths that do not fully match for some reason so we
filter out edges that contain nodes that are not in the original path

tgbugs/pyontutils,tgbugs/pyontutils,tgbugs/pyontutils,tgbugs/pyontutils