initial commit for devl branch
small update
added alloc node type
added subref-ref simplification
almost all tests pass
added array of composite types
composite types still buggy, improve rule indexing
arrays of composites still not working
added for loops, to be debugged
before branching
started changing for loops
advanced for loops
advanced for loops
Merge branch 'devl2' of https://github.com/fredo-dedup/ReverseDiffSource.jl into devl2

Conflicts:
	src/graph_code.jl
	src/proto_test.jl
advanced for loops
improved for loops, not over yet
improved for loops, not done yet
improved for loops,again
for loops, almost there
minor tweaks for for loop