New results for poissson3d, test6, comparing against bpf

Added Time_tol input
modified:   lagrange_bifurcation/rayrun.sh

New .gitignore file, added the new executable.
new file:   poisson_three_d/.gitignore

Complete results for comparing against bpf
new file:   poisson_three_d/test6_compare_bpf/from_csf/test6_compare_bpf.tar.gz

Added Time_tol parameter.
modified:   ray_general_problem_parameters.h
Navier stokes parallel tests done. Results have been extracted.
See the file results_ns_cube.ods