Fixed

• track unknown outputs as Top (#179)

Other

• AsRef for SimpleValuationState (#180)
• Implement Display trait for SingleValuationLocation (#178)
• handle extrapop adjustment for Call operations in valuation state (#177)
• From<Vec> for SimpleValuation (#175)
• Display and LowerHex for SimpleValue (#174)
• SimpleValuation::add() (#173)
• Implement JingleDisplay for SingleValuation types (#171)
• Add generic get method to SimpleValuation (#172)
• iter method to SimpleValuation for iteration (#169)