Allow users to omit `forall`

Just an idea I wanted to get out there, I don't think it causes parsing ambiguity

-- id :: forall a. a -> a
id :: a. a -> a

-- everywhere :: (forall b. Term b => b -> b) -> (forall a. Term a => a -> a)
everywhere :: (b. Term b => b -> b) -> (a. Term a => a -> a)

I think it looks beautiful but clearly more difficult to Google or grep for.

Trac metadata

Trac field	Value
Version	8.2.1
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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