[cvs-nhc98] Merge from stable-1-06-branch.

malcolm: Tue Sep 11 19:26:29 CEST 2001 Update of /usr/src/master/nhc/src/prelude/IOExtras In directory hinken:/tmp/cvs-serv13502/IOExtras Modified Files: DIOArray.hs Log Message: Merge from stable-1-06-branch. Move class Ix out of Prelude into Ix library. (But undo the change whereby Ord was dropped as a superclass of Ix.)