finiteArea fails with calcPointAreaNormals

This issue has been tagged internally (EP1619) and @vaggelisp did some investigation (notes in !490 (merged)).

Here are some of his notes reattached:

Ahmed-FaMesh-3453d169.tar.gz ... makeFaMesh still fails for hierarchical: coeffs (5 4 2), with a different error this time (floating point exception in calcPointAreaNormals)

[23] #1  Foam::sigFpe::sigHandler(int) at ??:?
[23] #2  ? in /lib64/libpthread.so.0
[23] #3  Foam::faMesh::calcPointAreaNormals() const at ??:?
[23] #4  Foam::faMesh::pointAreaNormals() const at ??:?
[23] #5  Foam::faBoundaryMesh::calcGeometry() at ??:?
[23] #6  Foam::faMesh::faMesh(Foam::polyMesh const&) at ??:?
[23] #7  ? at ??:?
[23] #8  __libc_start_main in /lib64/libc.so.6
[23] #9  ? at ??:?

Along with some discussion notes: