Some generator heat rate increments are less than minimum stable level

[oconnellm]

A couple of the smaller generators have their first heat rate load point at a value that is less than their min gen. This means at min gen they are already in the second heat rate increment. May not be a problem though.

[claytonpbarrows]

I think this should be fixed with the correct mingen values now

[claytonpbarrows]

see #15