Price taker model for DISPATCHES, Rehashed

[djlaky]

Fixes

Compared to #1201, operational constraints mathematical form was corrected. Unnecessary functions were removed/merged. Additional user flexibility was added for constructing cost objectives.

Summary/Motivation:

Resurrecting #1201 to finish price taker framework in accordance with project milestones.

Framework allows the user to construct price-taker models for design and/or operational optimization considering time-varying market price data.

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[ksbeattie]

@djlaky we're hoping to cut a release at the end of the month - next week. Do you think this will be done in time for that?

[adowling2]

We will not have time to incorporate the feedback from Andrew. If we are okay with merging without those suggestions (maybe open an issue to track proposed changes), then yes, this can probably get merged.

[ksbeattie]

Pushing this to the Aug release

[ksbeattie]

@djlaky any update on this?

[ksbeattie]

I'm moving this to the Nov release, since it doesn't look like it will make the Aug release.