updating schedule csv download report to match chw management page.
fix was putting right yield in the right inner loop, oy.
fixup call for OBSERVED dates vs. ANCHOR dates.

this fixes the dot calendar rendering by querying for OBSERVATIONS that could have happened at visits during ANCHOR Dates.

so for querying 1 anchor date, you can get at least 21 observations from it. (backwards looking).

On a larger range, multiple visits could result, and so the calendar is composited as such.
Merge pull request #18 from dimagi/pact-hotfix

Pact hotfix cont'd