Refactored weight code to split the work over Search, ResultURL, and Click models...

Refactored weight code to split the work over Search, ResultURL, and Click models. This is probably somewhat less efficient, but it makes more intuitive sense. It also allows for weight caching on instances. Initial work on a results action/view for the SearchAdmin. Set SearchView to have SearchForm set as an attribute on itself rather than blindly using it.