Summary:
All dune libraries in infer/src/ were declared with their own public
names, each one needing its own .opam file. There's no need for that:
they can all be part of the `infer` library by calling them `infer.Foo`.
One wrinkle: now we need to explicitly point at their .mld files in the
generated documentation.
Reviewed By: jberdine
Differential Revision: D20798914
fbshipit-source-id: 64b64261c