use ListOps::identity() instead

autoDensity: Change to reference and correct typo
surfaceConformation: Include Delaunay cells that are entirely made
up of boundary points. Also increase the length of the line to intersect.

Also provide option to not do inside outside test when reading points into
foamyHexMesh from file

- Write some comments

- Update point conversion routines
- Slightly more efficient point redistribution

- Added indexedVertexOps namespace
- Added indexedCellOps namespace

tutorials/mesh/foamyHexMesh/mixerVessel: use hierarchical rather than scotch for decomposition due to bugs in scotch