Finish port to GHC 6.4.

	* src/Monad.hs: Rename to ...
	* src/VMMonad.hs: New.
	* src/Makefile.am: Update.
	* src/Level.hs, src/Code.hs, src/Report.hs, src/Preload.hs, 
	  src/Eval.hs, src/RuntimeCommon.hs, src/RuntimePrint.hs,
	  src/Low.hs, src/RuntimeInput.hs, src/Plain.hs, src/Memory.hs,
	  src/RuntimeString.hs, src/High.hs, src/RuntimeChar.hs, 
	  src/Runtime.hs, src/Main.hs, src/Cpu.hs, src/RuntimeSystem.hs,
	  src/Trace.hs, src/RuntimeInt.hs, src/Profile.hs
	
	     - Adjust dependencies ;
	     - Adjust API's calls.