Start values are not calculated properly if they depend on secondary parameters

[Lennart Ochel]

Start values are calculated before the secondary parameters which leads to div. by zero. The following model demonstrates the wrong behavior:

model A
   parameter Real a(fixed=false);
   Real x(start = 1.0,fixed=true);
   Real y(start = 1/b,fixed=true);
   parameter Real b = 5.6 / a;
initial equation
   x*2 = a;
equation
   der(x) = 0;
   der(y) = 0;
end A;