Andrew Gibiansky created all these package stack.yamls with this commit:

> commit f9846b6b
> Author: Andrew Gibiansky <andrew.gibiansky@gmail.com>
> Date:   Tue Jun 7 17:26:47 2016 -0700
>
>     Separate stack.yaml for each package for simplicity

The resolvers for all these stack yamls originally agreed with the
root stack.yaml, but now they're way off, apparently out of neglect.
Let's just delete them.

Change program type from ByteString to String and remove RankDir because
that can be configured in the input.

Requires 'Graphviz' installed.

This file was giving a strange error/warning that had to be disabled.

After investigating this issue (https://ghc.haskell.org/trac/ghc/ticket/15601)
it turns out this was due to an wart in the way type level lists are handled
in GHC. Fortunately a workaround is available allowing the warning to be
re-enabled.

GHC 8.4 allows value level operators (in this case list append, '++') to
be used at the type level, so that the singletons package for GHC 8.4
uses this operator whereas previous versions of singletons defined a ':++'
operator for type level append.

So it can be used both for static diagrams and animations.

Purpose: allow it to be used both for static and animated diagrams.

These are not needed with the declarative wrapper for size specifications.

Diagrams has (which I've always found a bad idea) moved
away from the `vector-space` package to `linear`, whose
combinators are all weird, in particular `*^` does not
actually scale vectors but scale-fmap functors. Combined
with the WAT-prone tuple functor, this gives wrong behaviour
when using tuples as vectors.

Well, `V2` is in doubt also more efficient than `(,)`, so...

This is better-behaved for diagrams with strong aspect ratio, in particular
it prevents diagrams with very low height from being stretched “infinitely
wide”.