- add some device and db independent model interfaces for activity samples
- use these model interfaces where possible
- chart activity does not do device dependent rendering anymore and uses
normalized values for all devices
- initial interface for daily summaries
Known issue: scrolling a zoomed-in chart interferes with swiping to the
next/previous chart (so far there's just one, but...)
Workaround: Swipe down and then left or right in one go, this will let
you scroll the zoomed chart