on a surface point.

Added tolerance static varible to cellSizeFunction and checks for points on or
very near to the surface and "snap" them to the surface to cell size.

Moved

    scalar maxProtrusionDistance = maxSurfaceProtrusion(vert);

out of the for loop in dualCellLargestSurfaceProtrusion, shouldn't have been in
- erroneous and expensive to calculate.

Stablised triSurfaceTools normalisation of c and added more info to FatalError
message.