Outage min soc

[hdunham]

Please check if the PR fulfills these requirements

• [x] CHANGELOG.md is updated
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce?

feature

What is the current behavior?

(You can also link to an open issue here) ElectricStorageInputs input soc_min_fraction always applies during outages

What is the new behavior (if this is a feature change)?

Added soc_min_applies_during_outages boolean field to ElectricStorageInputs (defaults to false)

Does this PR introduce a breaking change?

Specify soc_min_applies_during_outages in inputs if you would like it to be true

Other information: