[GHC] #710: library reorganisation

[Simon Marlow]

Bulat Ziganshin wrote:

> sorry for repetition, but ByteString library in its current state
> still don't replaces PackedString in functionality, because it don't
> support full Unicode range of chars

That's true, but frankly the current Data.PackedString is subsumed by 
[Char], so there's no good reason to keep it.  I'll stop saying that 
Data.ByteString is replacing Data.PackedString to avoid confusion.

Would you like to write a Data.ByteString.UTF8 to fill the gap?

Cheers,
	Simon