Some changes in the plot scripts.
Change heat transfer program.
Update test code.
Add new core statistics module.
Add more statistics code.
Do not delete type.
Merge branch 'master' of github.com:flavioc/meld

Conflicts:
	Makefile
	tests/code/dfs.m
	tests/code/graph_coloring1.m
	tests/code/graph_coloring2.m
	tests/code/linear-keep1.m
	tests/code/linear-keep2.m
	tests/code/linear-ref-use.m
	tests/code/linear-shortest-path-cycle.m
	tests/code/mfp.m
	tests/code/mwst.m
	tests/code/pagerank-linear-sync.m
	tests/code/pagerank1.m
	tests/code/pagerank2.m
	vm/exec.cpp
	vm/program.cpp
	vm/state.cpp
	vm/state.hpp