Stop derivatives of an expression wrt to a select set of symbolic 

::

 stop_diff(MX expr, int order) -> MX
 stop_diff(MX expr, MX var, int order) -> MX

variables.

Extra doc: https://github.com/casadi/casadi/wiki/L_25o

Doc source: https://github.com/casadi/casadi/blob/develop/casadi/core/mx.hpp#L835

Implementation: https://github.com/casadi/casadi/blob/develop/casadi/core/mx.hpp#L835-L837

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