New Versions of both RedBlackStencil and RedBlackStencilOpt

I have renamed the previous RedBlackStencilOpt as just RedBlackStencil.
 The new version of RedBlackStencilOpt is a major rearrangement of
calculations and improves speeds by about 3 times.
Merge branch 'master' of https://github.com/idontgetoutmuch/Laplace

Conflicts:
	RedBlackStencil.hs
Overwritten with what was RedBlackStencilOpt