Recursive parameter definitions results in Stack Overflow

[Adrian Pop]

This model:

model RecursiveParameters "x depends on y which depends on x"
  parameter Real x = y + z;
  parameter Real y = x + a;
  parameter Real z = 1;
  parameter Real a = 2;
end RecursiveParameters;

will result in a stack overflow.
This happens both in the front-end and in the back-end. (The model only targets it in the front-end)
We should implement checks for recursive parameter definitions.

[Per Östlund]

This is fixed in r8063, at least for the front-end. I can't see any scenario where it will succeed in the front-end but fail in the back-end with this, so I consider this fixed for now. If there's still some issues you can reopen this bug.