put get_power_deriv inside Julia module

I added the get_power_deriv function at the end of Dynamic and Static Julia modules to remove the dependency of these modules upon the Dynare module

Please factorize the writing of the get_power_deriv() function, by creating a method similar to DataTree::writePowerDeriv().

Also note that nearbyint() is currently defined only in the dynamic case (but the factorization will automatically fix this).

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• 6ea7ff4c - factorize writePowerDerivJulia

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merged

mentioned in commit 20c27e99