* Changes in NIMH MonkeyLogic 2 (Nov 18, 2019)

+ SND and STM objects stop when turned off explicitly by toggleobject. Also
STM resets the output to 0.

Both objects can be reused multiple times during a trial. They first should
be explicitly turned off by toggleobject (although the stimuli already
ended). Then SND has to be rewound by the rewind_sound function before
toggled on. For STM, the retriggerable flag has to be set in the conditions
file.

- The problem that values of editables are reset when the Latency test or the
I/O test is executed is fixed.