Updated yaml_parser.F module

[arango]

I turned off the yaml_tree object creation switch IsCreated when deallocating object in routine yaml_tree_destroy. It is needed in the ROMS-JEDI interface.

!
!  Recall that Fortran 2003 standard allows deallocating just the
!  parent object to deallocate all array variables within its scope
!  automatically.
!
      IF (ASSOCIATED(self%list)) THEN
        self%IsCreated=.FALSE.
        DEALLOCATE (self%list)
      END IF