Major code clean-up

* Now uses one map-reduce view for all status panels: [`genomics-dashboard/dates_and_load_per_sample`](http://tools.scilifelab.se:5984/_utils/database.html?projects/_design/genomics-dashboard/_view/dates_and_load_per_sample)
* Reduction to project level done by a function `reduceToProject()` in dashboard.js
* All status panel drawing moved to dashboard.js (nothing in dashboard_all.html)
* Unused functions and a lot of commented-out code removed
* Functions doc updated