Brief HERTZ ABA update!

• Initial implementation pull request merged into bts_tools master branch.
• The period/wavelength (length of one cycle/oscillation) was reduced from 30.43 days (365/12) to 28 days (in line with the traditional work week) and a phase was applied to set wednesday as the primary Hz day (every wednesday will be the peak/trough/middle value). The verification script prove the wednesday alignment for the next 10 years at least.
• Additional pull request to change the amplitude to 14% (0.14). This combined with a period of 28 days yields a 1% change each day, which is much more stable for trough shorters.

TODO:

• Use matplotlib to produce charts within the python verification script, so users don't need to import the CSV data into excel to produce charts.
• Wait for BSIP-0018 to go live at the end of November, which will reduce/offset the risk of global settlement events.
• Find private price feed publishers & begin publishing the price feeds.