Inverse node.

::

 inv_node(MX x) -> MX

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

Doc source: https://github.com/casadi/casadi/blob/develop/casadi/core/mx.hpp#L793

Implementation: https://github.com/casadi/casadi/blob/develop/casadi/core/mx.hpp#L793-L795

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