Gav Wood authored Jan 12, 2017 and Arkadiy Paronyan committed Jan 12, 2017

* Return 0 instead of error with out of gas on estimate_gas

* Fix stuff up.

* Another estimate gas fix.

* Alter balance to maximum possible rather than GP=0.

* Only increase to amount strictly necessary.

* Improvements and optimisations to estimate_gas.

- Introduce proper error type
- Avoid building costly traces

* Fix tests.

* Actually fix testsActually fix tests