Value always generates Observable.auto from observables.

[back2dos]

This is quite heavy handed. When I optimized it away last time, it occasionally led to runtime errors during complex circular initialization. It should suffice to have an Observable.lazy<T>(f:()->Observable<T>):Observable<T> to solve that problem.

[back2dos]

Observable.auto has become relatively cheap, so perhaps this is a non-issue, but this needs to be dealt with before 1.0.