Add program to calculate the linear response of a system over a given frequency
interval.
Too many changes/additions to mention - see diffs.
	deleted:    field.dat
	new file:   lr.in
	renamed:    src/check_dependencies -> src/non-fortran/check_dependencies
	new file:   src/non-fortran/lin_resp.sh
	modified:   DATA/data_2level/gma.txt
	modified:   configure
	modified:   pp.in
	modified:   progs/post_proc.f90
	modified:   rho_prop.in
	modified:   src/freq_analysis.f90
	modified:   src/global_params.f90
	modified:   src/params.f90
	modified:   src/post_proc_params.f90
	modified:   src/print_mat_mod.f90
	deleted:    src/print_output_mod.f90
	modified:   src/print_params_mod.f90
	modified:   src/runge_mod.f90
This was meant to be done in last commit...
	modified:   configure
	modified:   pp.in
	modified:   progs/post_proc.f90
	modified:   rho_prop.in
	modified:   src/freq_analysis.f90
	modified:   src/global_params.f90
	modified:   src/params.f90
	modified:   src/post_proc_params.f90
	modified:   src/print_mat_mod.f90
	deleted:    src/print_output_mod.f90
	modified:   src/print_params_mod.f90
	modified:   src/runge_mod.f90