This can now be done by using an analytic function.

edges/faces were randomly getting negated normals (broken if/else condition).
Corrected a few typos in comments.

Conflicts:
	library/MultiRegions/ContField3D.cpp
	library/SolverUtils/EquationSystem.cpp

Conflicts:
	library/StdRegions/StdRegions.hpp

Shortened eInterpGaussEdge matrix generation routine.
Fixed some issues with AdvectionFR restructuring.

Changed VertexEdgeConnectivity etc maps to be static members of classes.
Tidied code in files that have been cleaned already.

Updated EquationSystem to pass field specific singularity check flags.