terminal() support

[Martin Sjölund]

terminal() is not supported in the generated code. Willi, could we support it by adding an extra event-handling iteration where terminal is set to true before finishing the simulation?
Or should we just make it return false?

{{{ model test111

Real a(start = 0.1);

algorithm
if terminal() then

a:=1.0;

Modelica.Utilities.Streams.print("terminal", "terminal.txt");
end if;

end test111; }}}

[Willi Braun]

added an extra event-handling iteration at the end of the simulation.