Parameter should be able to take other Parameters in their expression

[briandrawert]

Example: K1 = 2*K2

So you could have:

k1 = Parameter("k1", expression="1");
k2 = Parameter("k2", expression="2*k1");
model.add_parameter([k1,k2]);

[briandrawert]

also remove set_expression()

[briandrawert]

remove the line 360 in Model.py "self.expressions = {}"