Undocumented predicates

The following predicates are exported, but not or incorrectly documented.

 intra_construct1(Arg1, Arg2, Arg3, Arg4, Arg5)

 intra_construct1(Arg1, Arg2, Arg3, Arg4, Arg5, Arg6)

 intra_construct1(Arg1, Arg2, Arg3, Arg4, Arg5, Arg6, Arg7)

 intra_construct2(Arg1, Arg2, Arg3, Arg4, Arg5)

 intra_construct2(Arg1, Arg2, Arg3, Arg4, Arg5, Arg6)

 intra_construct2(Arg1, Arg2, Arg3, Arg4, Arg5, Arg6, Arg7)

 g2_op(Arg1, Arg2, Arg3, Arg4, Arg5)

 apply_g2(Arg1, Arg2, Arg3, Arg4, Arg5)

 apply_g2(Arg1, Arg2, Arg3)

 apply_g2(Arg1, Arg2)