Add a global variable table, so when we call "Var.mk id" twice, the
same variable is returned and when we call "Var.fresh v" we always
return a truly globally fresh variable.

- patterns used after a let binding must be enclosed in parenthesis
  consider : type t( 'a ) = [ 'a* ] ;;
  this function declaration works
    let (t(Int) & x) = [ 1 ] ;;
  while without parenthesis will raise a failure.

in everything else but parametric types of the for t('a)
there must be a space between the indetifier and the parenthesis

this is valid : let hd ( ...
but this is not valid : let hd( ...

now we can write types as
type t( 'a) = <a>'a

and patterns can contain type instantiations
let f = fun (t('a) -> [ t('a)* ]) x -> [ x ];;
let id = fun (t(Int) -> [ t(Int)* ]) x -> [ x ];;

Note: parametric types must be written as "IDENT(" without space.

Conflicts:
	CHANGES

- change syntax to avoid conflicts ( tried "((", "[<", "<[", "(" )
   type t {[ 'a,'b ]} = (Int,[ 'b* ]) ;;
   let app (f : 'a -> t {[Int,Int]} )(a : 'a) : t = f a;;

- type t 'a = ('a,'a)
- type t ('a,'b) = ('a,'b)

Fix Typer.pp_env printer for types
Minor code refactring

Fix minor problem in runtime/value.ml

Conflicts:
	Makefile.distrib
	depend
	ocamliface/4.01/Makefile

Prevent the compiler from statically allocating an persistent variant (that is mutated by the OCaml runtime)

Conflicts:
	runtime/value.ml

Make sure that the -g flag is correctly propagated to the auxiliary Makefile when compiling the ocaml/cduce interface

Conflicts:
	Makefile.distrib
	depend

Change $$ in >> in types.ml for the substitution operator

Conflicts:
	configure.ml

- add clflags.mli to the list of files imported from the ocaml source tree
- remove another use of #load for syntax extension loading.

Conflicts:
	Makefile.distrib

Change the default inlining from 10000 to 100 (OCaml 4.02.0 generates too large binaries with -inline 10000).

Conflicts:
	Makefile.distrib