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travis-pro

Use f64 instead of u256 for gas prices (#1515)

Gas prices are technically U256 but most of our code needs to some math
with them so we end up converting between u256 and f64 all the time.
With this commit we use f64 directly everywhere.

### Test Plan
Existing tests

14083 of 55971 branches covered (25.16%)

Branch coverage included in aggregate %.

3747 of 5843 relevant lines covered (64.13%)

40522.33 hits per line