Auto export class instance functions

[benl]

From Data.Array

export	index
	indexR
	array_map_
	array_foldl

instance Functor Array where
	map_		= array_map_

instance Foldable Array where
	foldl		= array_foldl

We must manually export array_map_ and array_foldl_ because they are used in the type class instance.

Probably want to add proper module namespaces for this.