Write to standard output instead of standard error

Overlap/Tests/test_overlap.f90

 program test_overlap
 
-  use, intrinsic:: ISO_FORTRAN_ENV
-
   ! Libraries:
   use jumble, only: get_command_arg_dyn, read_opcol, new_unit, ediff1d, assert
   use shapelib_03, only: dbf_read_attribute_03
@@ -34,8 +32,8 @@ program test_overlap
   call config_graph(rank = 0)
 
   ! main_nml:
-  write(unit = error_unit, nml = main_nml)
-  write(unit = error_unit, fmt = *) "Enter namelist main_nml."
+  write(unit = *, nml = main_nml)
+  print *, "Enter namelist main_nml."
   read(unit = *, nml = main_nml)
   write(unit = *, nml = main_nml)