- Re-enable orphan warnings that were manually disabled in many modules
- Remove non-Haskell files that were just sitting in the source tree
- Remove modules that were not called from anywhere
- Remove unused dependencies

This is not exhaustive by any means. In particular, some more weeding out
can be achieved by looking at individual functions and even branches of
functions. Weeder can help with that.

This contains only data, removes some Database dependency in imports.

Basically, Gargantext.Prelude exports all of Protolude now.

They are changed to MaybeFields ...Read instead when joining.