-Improved Meta-Graph performance

-Fixed bug using ILP when selecting heuristic mode
-Fixed bug with discarding solution sometimes not removing subgraphs/metagraph
-Fixed bug with infinite gap values being formatted incorrectly
-Enabled highlighting of clusters in meta-graph
-Enabled returning to original network view upon result destruction
-Fixed bugs with cluster-view sometimes using incorrect styles/layout
-Reworked concurrency / synchronization
-Various smaller performance issues