Bugfix that was being masked by intel compiler.  Fixes #4.

The interpolation matrices jgl, jgt, dgl, dgt were supposed to be
saved to reuse them from iteration to iteration.  When I ported
from the common block, I never added the save attribute.

Intel was nice enough to keep the allocations in the same memory,
so it worked anyways.  gcc was less forgiving (and more correct).
Fixed now.  gcc/gfortran works for RTI_LST.