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Explanation of Changes
Adding gas metering for filters as described in Issue #449.
The gas used amount is constant for a given filter type and replication factor regardless of whether the filter returned an error or not. If the filter was not applied at all, the gas used is zero.
The gas used towards filtering is subtracted from the gas limit we feed into the tally VM.
In addition, the tally gas used amount is now the sum of the gas used by the tally VM and the gas used by the filter.
Testing
Added checks to the existing filter tests
Related PRs and Issues
Closes #449