Quick Refactor for UndirectedSpanningForest Function #350

Job	Run time
--with-external-bliss --with-external-planarity	5m 21s
--enable-debug --enable-compile-warnings --without-intrinsics	3m 14s
--with-external-planarity	5m 39s
--with-external-bliss	5m 35s
--enable-debug --enable-compile-warnings	3m 33s
--enable-compile-warnings --without-intrinsics	3m 10s
--enable-compile-warnings	3m 20s
--enable-debug --without-intrinsics	3m 28s
--enable-debug	3m 24s
--without-intrinsics	3m 16s
	40m 0s

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