updated license year
renamed LAPACK real, double precision solver component type, to be consistent with the other (3) solver specialisations
Linear system multiplication "multi" is now a first-class absent function (pure virtual method) just like the cousin "solve" (why didn't I do this in the first place?). Related changes to kernel plugin solvers, bug fix in GMRES matrix multiplication (I think, though nothing is throughly tested yet).
Related changes to new first-class "multi" method in linear system base class.
Renamed MKL solvers base class, it does not comply with new "multi" base linear system method yet so it doesn't compile (yet).