Draft: Removed parentheses around singular type class contexts. Removed superfluous whitespace.

This patch touches a lot of files but it is only housekeeping, like removing parentheses around superclasses and contexts:

-class  (Fractional a) => Floating a  where
+class Fractional a => Floating a where

and stripping redundant whitespace. I assume the sentiment is uncontroversial but the scope may be too large. I am open to suggestions.

-class  Bounded a  where
+class Bounded a where