Compile this code with this command:

    ncargcc test_interp.c dointerp.c contr.c -o test_interp

test_interp.c is the main program.
nestwind.c creates u,v nested grid arrays.
dointerp.c does:
	- initializing the nest (creating it from coarse grid values)
	- moving the nest
	- setting (only) boundary condition points for the nest
	- feedback from the nest to a coarse grid