template cases: added cylindrical background mesh in rotating geometry cases

snappyHexMesh produces a far better quality AMI interface using a cylindrical background mesh,
leading to much more robust performance, even on a relatively coarse mesh.  The min/max AMI
weights remain close to 1 as the mesh moves, giving better conservation.

The rotating geometry template cases are configured with a blockMeshDict file for a cylindrical
background mesh aligned along the z-axis.  The details of use are found in the README and
blockMeshDict files.