#12 .notify internal action

[Jomi Fred Hubner]

create a .notify internal action to be used with .wait (monitor system)

in some intention:
.wait(vl(X)); // wait event that unifies vl(X)
in another:
.notify(vl(10)); // produce event vl(10)

Note that the event produced by .notify is an 'untyped' event. It is not bel add, not new goal. It is used only for this mechanism. no plan will be triggered by the events produced by .notify.