Warrants should use EmixBase not EmixProduct

Found this when trying to get PowerQualityWarrants right.

The emix:QualityWarrantType is, like most warrants a variety of a product. Recall the shorthand that a Product is a Product Description applied to a schedule. power:qualityMeasure is defined to fit in the role of the product description, i.e., to be applied to the schedule. (We warrant quality power throughout the day until evening, when its mostly wind power and we anticipate sags and flicker...) It is possible to create a schedule for quality, as it is for all other warrants. Quality measure is just the things we are using inside the schedule, which is already inherited.

Well, this is almost correct. An EMIXBase is the underlying object of the Description and the Schedule. A Product is the one that has sides, and transactive states and market contexts, etc. Tracing this change through reveled this same error in other warrants. They should all use the EMIXBase rather than the EMIX Product.

THese changes need to be made to the other warrant types as well. Note, that Product is derived from Base, so if someone did have a need to use product thre, it is still legal to do so.