`SLSQPFitter` supports all these constraints. However, for clarity of the example, and because "ineqcons" and "eqcons" are specific to SLSQP and have not been tested much,  I think we can exclude them. 

Also it may be good to add a comment that the call to `_model_to_fit_params()` is needed in order to deal with "fixed" and "tied" constraints. It also handles "bounds" for optimization algorithms which (unlike SLSQP) don't internally handle it. Because "fmin_slsqp" works internally with bounds, they must be passed to it in the correct form (see comment below).