Fixed some bugs in the parsers/interface. Added NAV and made the
solidity correct
Revert "Fixed some bugs in the parsers/interface. Added NAV and made the solidity correct"

This reverts commit ed90941ce3fba7b8c5d811348830f555e9505045.
Revert "Fixed div method to work with odd numbers too. Also changed the toString method, toString now works for a*10^(-b)."

This reverts commit aa28d4533f2f27d907bd169cd1aea78e0f561b59.