Give access to dalphar_ddelta_consttau and dalphar_ddtau_constdelta in high-level api; closes #1010
Give access to dalphar_ddelta_consttau and dalphar_ddtau_constdelta in high-level api; closes #1010

henningjp/CoolProp,dcprojects/CoolProp,henningjp/CoolProp,CoolProp/CoolProp,CoolProp/CoolProp,CoolProp/CoolProp,JonWel/CoolProp,CoolProp/CoolProp,DANA-Laboratory/CoolProp,JonWel/CoolProp,dcprojects/CoolProp,DANA-Laboratory/CoolProp,DANA-Laboratory/CoolProp,henningjp/CoolProp,CoolProp/CoolProp,JonWel/CoolProp,henningjp/CoolProp,CoolProp/CoolProp,henningjp/CoolProp,henningjp/CoolProp,henningjp/CoolProp,JonWel/CoolProp,DANA-Laboratory/CoolProp,DANA-Laboratory/CoolProp,dcprojects/CoolProp,JonWel/CoolProp,JonWel/CoolProp,dcprojects/CoolProp,dcprojects/CoolProp,DANA-Laboratory/CoolProp,dcprojects/CoolProp,CoolProp/CoolProp,henningjp/CoolProp,JonWel/CoolProp,CoolProp/CoolProp,DANA-Laboratory/CoolProp,dcprojects/CoolProp