Some reorganization in preparation for OpenACC version of QTC.
Removed unnecessary programming model-specific includes from common files.
Checkpointing.  Don't expect this version to work.
Implemented CPU-only QTC version based on existing OpenMP version.
Removed QTC tail recursion.
Added ability to seed RNG, switched to use Point struct instead of adjacent floats in array.
Make the type of a constant explicit to satisfy one of the recent compilers.
Added NoResult results for tests not implemented in OpenACC Spmv.