data quality checks

[wholmgren]

Use case 1.B Calculate expected performance includes

• User can select data quality checks to be applied to uploaded weather data.
• Platform applies data quality checks.

and there's some additional info in 6.B Apply data quality checks (stretch).

pvanalytics provides the basic validation functions for individual checks. solarforecastarbiter-core.validation.tasks includes a set of functions for composing the basic checks into validation workflows that are tightly coupled to the Arbiter's datamodel. The results of those tasks are used in other parts of the package. solarforecastarbiter-dashboard contains a minimal user interface for selecting if problematic data should be excluded when creating an analysis report. Adapting the Arbiter task/interface code to Solar Performance Insight would be a big lift, so I'm going to mark this with "Someday" in anticipation that we won't be able to complete it during the initial development.