warn if one tries to override secondary parameters

[Lennart Ochel]

I think the simulation should display a warning at least if one tries to override secondary parameters.

Please, checkout the following example:

loadString("
model Test
  Real y;
  parameter Real p = 1;
  parameter Real q = p;
equation
  y = q + time;
end Test;
"); getErrorString();

simulate(Test, simflags="-lv=LOG_SOTI"); getErrorString();
val(q, 0.0); getErrorString();
val(y, 0.0); getErrorString();

simulate(Test, simflags="-lv=LOG_SOTI -override=q=2"); getErrorString();
val(q, 0.0); getErrorString();
val(y, 0.0); getErrorString();

q will be 1 (actually p) for both cases. Any comments?