Compare to correct in location_mods

[hkershaw-brown]

These arrays are pretty big to allocate, and are only used if you are doing COMPARE_TO_CORRECT

DART/assimilation_code/location/threed_sphere/location_mod.f90

Lines 1442 to 1444 in 59b75b7

	! Variables needed for comparing against correct case
	integer :: cnum_close, cclose_ind(size(locs))
	real(r8) :: cdist(size(locs))

Originally posted by @hkershaw-brown in #910

[hkershaw-brown]

Q. why is threed cartesian doing an exhausting search?

DART/assimilation_code/location/threed_cartesian/location_mod.f90

Lines 1380 to 1382 in 59b75b7

!> @todo this is doing an exhaustive search each time. expensive
!> but should give the right answer.
if(.true.) then

Originally posted by @hkershaw-brown in #910