New generic setup mechanism

modified:   lagrange_square/sq_lgr.cc
modified:   rayheader.h
Before big rewrite of header file
Finished modifying new way of applying the preconditioner.
It is now just a few function calls and setting parameters.
modified:   lagrange_square/run.sh
modified:   lagrange_square/sq_lgr.cc
modified:   rayheader.h