Cyclic dependencies not detected for conditional parameter or constants

[Per Östlund]

Cyclic dependencies are only detected for parameter or constants, or variables with conditions, but not for parameters or constants with conditions:

model M
  parameter Boolean a = true if b;
  parameter Boolean b = true if a;
end M;

Inst.getElementDependencies needs to be fixed to handle this.

[Per Östlund]

I think I may have fixed this a while ago. Anyway, the cyclic dependencies are detected now.