Changes

Adding boundary conditions for the wp3_term_ta_ADG1_lhs subroutine.
The value of wp3_zm at the model lower and upper boundaries is now
assumed to be 0 for simplicity and conservation.

For single loop vectors, removing the "collapse(2)" from the acc statements.

This commit is not bit changing, but the previous commit to this branch
was BIT_CHANGING:902d6caed8a4533f59f4165106276959b4f90895