Support for unsafely thawing your (Byte)Arrays, i.e., added the
following ops:

 MutableArray.unsafeThawArray :: Ix ix => Array ix elt -> ST s (MutableArray s ix elt)
 MutableArray.unsafeThawByteArray :: Ix ix => ByteArray ix -> ST s (MutableByteArray s ix)
 MutableArray.thawByteArray :: Ix ix => ByteArray ix -> ST s (MutableByteArray s ix)

 ST.unsafeThawSTArray 	    :: Ix ix => Array ix elt -> ST s (STArray s ix elt)
 LazyST.unsafeThawSTArray   :: Ix ix => Array ix elt -> ST s (STArray s ix elt)

 IOExts.unsafeFreezeIOArray :: Ix ix => IOArray ix elt -> IO (Array ix elt)
 IOExts.unsafeThawIOArray   :: Ix ix => Array ix elt -> IO (IOArray ix elt)

+ removed the re-exportation of Monad that ST and LazyST did.