Bug fix: remove assert from use list

I added assert in commit 83123e30, I do not know why, it was not used.

Inst_eddies/Tests/test_nearby_extr.f90

@@ -3,7 +3,7 @@ program test_nearby_extr
   ! Libraries:
   use jumble, only: get_command_arg_dyn, new_unit
   use mpi_f08, only: mpi_init, mpi_finalize
-  use nr_util, only: deg_to_rad, assert, rad_to_deg
+  use nr_util, only: deg_to_rad, rad_to_deg
   use shapelib_03, only: dbf_read_attribute_03
 
   use derived_types, only: snapshot, shpc