Tracking new files which I should probably delete...

loop_amg.sh
unstructured_three_d_fluid_brick.cc
unstructured_three_d_fluid_change_to_brick.cc
unstructured_three_d_fluid_tet.cc
Moved mesh files into tetgen_files_old
renamed:    problem_sketch.lay -> tetgen_files_old/problem_sketch.lay
renamed:    problem_sketch.lpk -> tetgen_files_old/problem_sketch.lpk
renamed:    three_d_unstructured_fluid.mcr -> tetgen_files_old/three_d_unstructured_fluid.mcr
New run.sh format
Cleaning up sq_po.cc
sq_po will be the standard square parallel outflow.
I will make self tests for all these stuff since it's annoying when
things break without me knowing.

Similarly for these:
new file:   .gitignore
modified:   Makefile.am
modified:   sq_po.cc
new file:   sq_po_semipara.cc
new file:   sq_po_tf_semipara.cc
new file:   sq_tf.cc
modified:   sq_tf_po.cc
new file:   sq_tf_semipara.cc
modified:   sq_van.cc
new file:   sq_van_po_semipara.cc
Generalised sq_po.cc, with updated rayheader.h
Renamed sq_po to sq_lgr
Makefile for sq_lgr added.