update: testing again
UPDATE: working version. Tested against the std version of the code gives perfect results.
Converges in a larger number of iterations. More development to come.
add grid_vars.h
Small commitment
index on (no branch): 271a5be Small commitment
WIP on (no branch): 271a5be Small commitment
Merge commit 'c9f6908' into devel_interface

Conflicts:
	interface_diag.f
	tmp.f
	variables.h