surfaceCheck output

1. it does not display the number of badquality triangles.
2. it has no way of visualising these (apart from surfaceSubset+Dict)

Attached start of adding writeSet option to surfaceCheck. This needs to be extended to output strings of edges. See ep #703 (closed). surfaceCheck.C

Typical output:

   min 0 for triangle 110081
    max 1 for triangle 985653

--> FOAM Warning : 
    From function int main(int, char**)
    in file surfaceCheck.C at line 483
    0. This might give problems in self-intersection testing later on.
Dumping bad quality faces to "badFaces"