Issue/62 update columns

[peterdudfield]

Pull Request

Description

Update saved validation results

Columns:

t0_datetime_utc target_datetime_utc :The datetime the forecast is about. i.e. t0_datetime_utc + (forecast_timestep_i * forecast_sample_period) forecast_gsp_pv_outturn_mw actual_gsp_pv_outturn_mw gsp_id batch_index (optional, but useful for debugging) example_index (optional, but useful for debugging)

Fixes #62

How Has This Been Tested?

add unittests

• [ ] No
• [x] Yes

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] I have checked my code and corrected any misspellings