Removed dprev array, which is no longer needed.  The displacement increments are now copied directly from deld into dispvec at the end of a time step.
Removed dprev array, which is no longer needed.  The displacement
increments are now copied directly from deld into dispvec at the end
of a time step.


geodynamics/lithomop,geodynamics/lithomop,geodynamics/lithomop,geodynamics/lithomop