Factor loader into a database storer and a batch loader

I'm always wary of the "miscellaneous" class as it fast becomes a dumping ground for things that "don't necessarily fit anywhere".

`ManifestUrl()` is only ever used in ` loadclient/scooploader.go` so perhaps it should live there? Or at a minimum in that package? Need it be public?

`LoadChecker{}`, similarly, is only referenced in one location in this project.

`InitLogger()` and `InitStats()` are used in our two `main` packages. This is as a result of this project producing two binaries, our first such project. I'm not sure what to do here. Both of these seem part of the notion of a context within which a program is run (I disagree with this point w.r.t. Logger(), as discussed above... but I'm working with it), so we need some way to encapsulate that. I'm just not sure what.