New commands WHENFLUSH, HOTFLUSH and SCROLLFLUSH.
They remove any associated triggered WHENs from the queue. Useful for
multiple overlapping WHENs, HOTSPOTS or SCROLLBOXes where you want to
prevent any extra actions.
Syntax is the same as WHENDISABLE, HOTDISABLE and SCROLLDISABLE. They
accept one or more variable names, wildcards accepted.
----------------------------------------------------------------------------