[Bug-apl] Monadic ⊣ changed

[Juergen Sauermann]

Hi,

I have changed monadic ⊣ to be more efficient.

The old behavior was that ⊣ B was a copy of B but as a committed value.
The new behavior is that ⊣ B is 0 as a committed value of 0 (instead of B).

The original purpose of monadic ⊣ was to suppress the printout of B and that still works.

The new behavior makes a difference if the result of  ⊣ B is assigned or otherwise used
(and in that case ⊣ was unnecessary). In those cases monadic ⊢ can be used instead of ⊣.

/// Jürgen