Add check for self-referencing matrix dimensions

[Martin Sjölund]

Dymola gives an error for this, and works fine if the matrix is square. OpenModelica does not complain enough (this makes me uneasy, and should make this bug top priority).

model M
  Real A[:,size(A,1)] = {{1,2}};
end M;

[Per Östlund]

The new frontend gives an error for this:

Error: Type mismatch in binding ‘A = {{1, 2}}‘, expected array dimensions [1, 1], got [1, 2].

which I guess is good enough.