The compare function compares the contents of two MPC objects MPC1, MPC2.
If the design specifications (models, weights, horizons, etc.) are
identical, then yesno is equal to 1.
compare may return yesno=1 even if the two objects are not identical.
For instance, MPC1 may have been initialized while MPC2 may
have not, so that they may have different sizes in memory. In any case, if yesno=1 the behavior of the two
controllers will be identical.