Merge branch 'develop-fix-memory-leaks' into release-v8.1.0 (PR #1160)

This merge fixes memory leaks due to duplicate allocate calls on pointers in the
file structs_and_variables.inc. This file is auto-generated and then included by,
e.g., src/core_atmosphere/mpas_atm_core_interface.F at compile time. No
functional changes are introduced by this merge.

For example, in the auto-generated file
src/core_atmosphere/inc/structs_and_variables.inc, there are code snippets
similar to the following:

  subroutine atm_generate_pool_mesh(block, structPool, dimensionPool, packagePool)

  ! ... (Unrelated lines omitted) ...

        type(mpas_pool_type), pointer :: newSubPool

  ! ... (Unrelated lines omitted) ...

        allocate(newSubPool)
        call mpas_pool_create_pool(newSubPool)
        call mpas_pool_add_subpool(structPool, 'mesh', newSubPool)
        call mpas_pool_add_subpool(block % allStructs, 'mesh', newSubPool)

  ! ... (Unrelated lines omitted) ...

  end subroutine atm_generate_pool_mesh

The problem is that the mpas_pool_create_pool subroutine already allocates the
pointer in its arguments internally. Therefore, calling allocate before
mpas_pool_create_pool actually causes memory leaks.

The fix adopted in this merge is to simply remove the generation of the
'allocate' calls in the 'structs_and_variables.inc' file for each core.

src/tools/registry/gen_inc.c

@@ -801,7 +801,6 @@ int parse_namelist_records_from_registry(ezxml_t registry)/*{{{*/
 
 		if(in_subpool){
 			fortprintf(fd, "\n");
-			fortprintf(fd, "      allocate(recordPool)\n");
 			fortprintf(fd, "      call mpas_pool_create_pool(recordPool)\n");
 			fortprintf(fd, "      call mpas_pool_add_subpool(configPool, '%s', recordPool)\n", nmlrecname);
 			fortprintf(fd, "\n");
@@ -1886,7 +1885,6 @@ int parse_struct(FILE *fd, ezxml_t registry, ezxml_t superStruct, int subpool, c
 	fortprintf(fd, "\n");
 
 	// Setup new pool to be added into structPool
-	fortprintf(fd, "      allocate(newSubPool)\n");
 	fortprintf(fd, "      call mpas_pool_create_pool(newSubPool)\n");
 	fortprintf(fd, "      call mpas_pool_add_subpool(structPool, '%s', newSubPool)\n", structnameincode);
 	fortprintf(fd, "      call mpas_pool_add_subpool(block %% allStructs, '%s', newSubPool)\n", structname);