Fix BPM Calculation for hrvplot
Added highlighting for high coherence sections. In the schema:
ZoneScore BLOB, 4 digits hexadecimal series, 0 = low, 1 = medium, 2 = high

Also added commented attempt to DROP rows in the database for aborted sessions.
Filtering for records under 2 mins, and fix to LoadBeatEmwave fn

LoadBeatEmwave now has better defaults

Also, added lots to TODOs and