###Date format: YYYY/MM/DD
2006/11/28: Revisit the Tools directory to get a simpler and better handling of
options. This should help to handle user's programs specific options.

2005/05/13: Help users to debug their color annotations
        - reflect the optional colors in the graphical semantics
        - give a graphical version of the parallel program that shows the
          mapping from colored skeleton trees to colored physical processors

          prog.gra -p3lroot ip_1:port_1#color_1 ... ip_n:port_n#color_n

2003/7/01: Changed the semantics to allow the use of skeleton-defined
	   stream functions inside an arbitrary Ocaml expression.

	   Now you use P3L skeletons as

		let f = parfun (fun () -> seq (fun _ x -> x));;

		...

		pardo (fun () -> while !continue do ... f (P3lstream.of_list [x;y]@l) ... done);;

	   In this first experimental version the loop combinator is not guaranteed to be correct.


	   Loop is incorrect because it does not handle "EndOneStream" correctly... the same logic
           as for "EndOfStream" should be used, but this requires copying/pasting code, so I prefer
           to leave it incorrect for now, while looking at a way of factoring this logic between
           the different stream markers...

	   Reducefun has been temporarily commented out (causing typing problems
	   when compiling the parallel semantics).