Enable Tx Fee Fingeprinting And Delay Analysis

[bonedaddy]

One method of resisting timing delay analysis through tx fee amount is indicated here and would be rounding the fee amount to a few digits however this fingerprints the implementation.

A possibility to avoid this would be randomly determining the number of digits, and round amount and set this via the configuration file. This in theory should mitigate fingerprinting the mychurnero implementation as a whole, however it would fingerprint an individual instance of a running mychurnero service.