Clean up @src database

There was a lot of redundant whitespace in the `@src` DB, much of it because code were aligned over multiple independent definitions or copied in verbatim from the actual source. This commit removes these, and all double spaces (that are not relevant for alignment).

Example:

```haskell
m >> k      = m >>= \_ -> k -- before
m >> k = m >>= \_ -> k      -- after
```

In addition to that, the incorrect remark `(.) = fmap` was removed.