Added derivation for relationship between saturation pressure and acentric factor
Added derivation for relationship between saturation pressure and acentric factor

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