updated wrapper with criticalproperties function..
Use SATSPLN whenever an error occurs, or output liquid density is lower than that of gas..

included a saturation state to the setState calls, so all props are essentially output..
Added transport property methods inside media "NH3_Water" for ammonia-water mixtures
Made package inside testers specifically to test ammonia-water mixture
1. partial derivative,
2. transport properties
Minor bug..
Merge branch 'debug'