- Modify Elaborate.hs to use the new code, not succesfully
- Add tests for FCO

Also make the output a bit prettier:
- Alternatives formatted onto their own line
- Use the <$> combinator instead of using 'pure ctor <*>'

sorry, no useful commit message today

The code now properly generates all possible substitutions that may be
made in any given type, including taking free variables into account.

- Allows specifying the size of types in gentermoftype separately
- gentermoftype can use type variables from the env when generating
arrow terms
- Add not-fully-functioning generation of TmTApp terms. It does
currently not handle free variables properly.

Ability to generate terms based on types and to generate types of
arbitrary size. Missing the functionality to generate terms using type
applications (as this is very complex to write).

typeclass

improve anything