RowLengths was renamed to CompressedRowsLengths.
OpenMP support wads added to matrix-vector multiplication and to scalar
products.
CSR format can use Cusparse for SpMV.

Min. interations feature was fixed in the GMRES method.
Timers for explicit and semi-implicit timestepping were added.

Implementing the SPMV benchmark.

Implementing the matrix formats tests.

Fixing parameters of operators to meet conventions and to allow compilation to be passed. Adding conversion from int to Real type in CSRMatrix to work with QuadDouble.

Adding explicit template instantiation.
Moving some _impl.h files into implementation dir.