added DIYPS S-curve predictions
predict 2 hours ahead, and display 6h total
stop using rawbgs for predictions, and merge some stuff from predictARLookback into iob-cob / predictDIYPS
display predict_hr of retrospective predictions instead of just 30m
replace sCurve with 30m of predictAR predictions
predict 4h and display 3h of predictions
average impact of predBg and predAR, don't sum them
workaround to AR to support 1-minute resolution
Revert "workaround to AR to support 1-minute resolution"

The workaround didn't really work, and introduced all kinds of issues. Going back to 5m resolution for now.

This reverts commit 66402c5a81b3e0e340c2118e94c862f159952db8.
retrospective prediction: show with blue line where the 1h-prior prediction was (or would've been, if it'd been made knowing about all subsequent boluses and carbs)
display carb ratios
fix predictDIYPS to actually use predictAR
show 4 days' data instead of 2
use last 200 treatments for retroPrediction
start predictAR from most recent datapoint, not lookback-ago
use treatment.created_at not treatment.date to calculate COB
display IOB/COB, and make blue/white dots smaller
show IOB/COB properly for retrospective brushing too
Merge pull request #12 from nightscout/wip/iob-cob

Wip/iob cob