Refactor parallel API.
Add CVSIP backend.
Adjust tests and benchmarks to API changes.
Improve multi-threading support.
Add FFTW backend.
Add example files.

Add example files from Sourcery VSIPL++ 3.3-12, as provided by
J. Kepner.  These files are licensed under a BSD license; the
license headers are exactly as in the files delivered by Mentor
Graphics and have not been altered.
Add SSAR application.

Add SSAR application files from Sourcery VSIPL++ 3.3-12, as provided by J. Kepner.  These files are
licensed under a BSD license; the license headers are exactly as in the files delivered by Mentor Graphics
and have not been altered.

Note that this does not include the SSAR data files for size reasons.  The README file contains pointers to
the origins of this benchmark, and the reference Matlab implementation files (which can be tracked down
from those pointers) contain scripts to regenerate the input data.
Adjust examples to refactored API.
Add packaging logic.
Add HDF5 and PNG file I/O.
Improve SSAR app.
Add basic documentation.