i.e. this leads to:
    double* x_vec = &x(lfsv,0)
only works for Qk elements!
Problem: the coefficient is const, but I don't know how (if) loopy can generate a const double*

It has single precision support...

will be superseded by our actual model anyway.

We run ut of PIDs during a typical run on KNL.

Additionally, uses the right number of subrefined intervals in the blockstructured case

This reverts commit c33945c3.