- real constants are hidden in Real.ml{i} module

- copy_var_decl now keeps the generated type

- Renamed type declarations as lustre_types and machine_code_types

          Solved the misrenaming of imported nodes (eg int_to_real)

	- mutations that could not be performed (ie. changing an integer constants when no integer constant appear in the program)
	- infinite computation of mutants, because of unproper randomization.

- no more classic display for ocamlc
- compilation warnings removed

mostly a recovery of an ancient svn repo: mutations