Compile this code with this command:

   ncargf90 test_interp.f90 dointerp.f90 contr.f90 -o test_interp

test_interp.f90 is the main program.
nestwind.f90 creates u,v nested grid arrays.
dointerp.f90 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