Remove deprecated uninitializedFill

This removes a function branch that I deprecated for 2.062. Not that long yes, but:

1. The call was just plain *wrong* to begin with.
2. My static assert was actually upside down. This means that: Either your code was "semi correct" but didn't compile, or was "totally wrong".

Either way, I think we should just do away with it now, instead of "fixing" it.