equations is not done at all yet). Also, print the clock decorations
(when clk) in the generated file.

and PredefEvalClock.

SolveIdent.recognize_predef_op  that  replaces  node call  by  Predef
constructor  when   necessary,  via  a  complete   traversal  of  the
SyntaxTree (instead  of doing it  in the parser). The  rationales for
this change are that:

- it is quite tedious to do it in parser as multiple locations are involved
- I did missed some locations
- It makes the parser more focused on parsing issues
- that traversal  is a first step  do deal with  idref solving (hence
 the name of the new module that contains that function

Note that lsrc/test/should_work/fab_test/lecteur.lus was using
"plus" as a variable ident, which raised an error, which

(well, for the first file, the numbers were ok :-).

Also, begin to sort out a little bit the mess in the Global module.

Moreover, augment the necessary print level of most internal structure
dumping function.

of "red<<if, 3>>".

Put the unification stuff in  a dedicated module, and add some random
unit tests to it.

t, and a node returning such a t, the compiler was actually returning
the type definition of t (instead of the abstract type).

In  order  to fix  that,  it  was necessary  to  add  in argument  of
Lazycompiler.solve_x_idref  a  flag  (named provide_flag)  indicating
whether the  item being  compiled appears in  the provide, or  in the
body part of the package.

This fix  triggered another bug that  we also fix: indeed,  it is not
correct to return  a compile error when the  provided parameters of a
node is not equal to  its implementation. Indeed, such parameters can
be abstract type that are defined in that package.

The test "should_work/packEnvTest/packages.lus" is now ok.

not compile them is (well, was) the default...).

also, during pretty-printing, remove the type in the constant definition
(e.g., "const x = 42;" instead of "const x = 42:int;"), except if it is an abstract
constant of course

For non-regression tests, do not use Lazycompiler.test function
anymore and just use  LazyCompiler.node_check instead.

put in the new file compiledDataDump.ml all the stuff
related to string convertions of CompiledData items.

and anonymous structures. I've even found some type errors in the non-reg files!

operators. Predef contains the abstract syntax of those operators (taken
for SyntaxTreeCore.by_pos_op), and PredefSemantics contains:

 - const_eval: that says how to statically evaluate constants
 - type_eval: that provides the type profile of predef operators
 - clock_eval: that provides the clock profile of predef operators

The code in EvalConst that dealt with predef const evaluation is now in
Predef.const_eval

EvalNode.f -> GetEff.node,
EvalType.f -> GetEff.typ,
EvalEq.f -> GetEff.eq

EvalConst.f (val_exp -> const_eff list) should have been put there too,
but in fact EvalConst.f ougth to be splitted in two parts:
  - val_exp -> val_exp_eff (but this function already exist)
  - val_exp_eff -> const_eff list

Therefore, the signature of EvalConst.f will be changed to:
val_exp_eff -> const_eff list (and will use GetEff.val_exp)

Ditto for eval_array_index.

 eval_array_index : CompiledData.id_solver -> SyntaxTreeCore.val_exp -> int -> int

ougth to be splitted into two functions:
   - CompiledData.id_solver -> SyntaxTreeCore.val_exp_eff
   - SyntaxTreeCore.val_exp_eff -> int -> int

Ditto for eval_array_size

 eval_array_size : CompiledData.id_solver -> SyntaxTreeCore.val_exp -> int

ougth to be splitted into two functions:
   - CompiledData.id_solver -> SyntaxTreeCore.val_exp_eff
   - SyntaxTreeCore.val_exp_eff -> int

arg... evalConst.f est utilis par GettEff.typ !!!

This is done via the new module EvalEq.

A lot of new errors appear in the on-reg tests, which is normal as
quite a lot of the code is now used...

used in order to make it homogoneous with what is done in SyntaxTreeCore.ml

This commit is related to the previous one actually.

Also remove all this story of node_half_eff that is not
used (yet), and that may not be useful (we'll see later).

Also continue to fix the representation of SyntaxTrreCore.node_info :
 -> remove the node alias
 -> put the corresponding infomation in node_body field
 -> rename node_body field into node_def
 -> associate to node_def (instead of a body option) a new union
type made of Abstract, Extern, Alias of ..., Body of ...

This allows us to
 - remove an "assert false" to deal with node with body and alias
(this new presentation makes it impossible)
 - Deal with Abstract node properly

currently only evaluates predef nodes.

git commit.

	Do not test nodes with static params as it is too difficult
  	to do from the top-level automatically. Indeed, it would
	require to build effective static arg before, which would
	require to make node_check mutually recursive with type_check
	and co. Its not worth the trouble, as such node can be tested
	anyway if used.

LazyCompiler.solve_node_idref:
	compile (with the new function check_static_arg) static
	params instead of ignoring them.

EvalConst.eval_const -> EvalConst.f
	for simplicity and homogeneity with the naming scheme used in EvalType.

	add a debug rule that hides the mli files and make debugging
	easier w.r.t. var printing.

src/syntaxTreeCore.ml (new file)
	Split      syntaxTree.ml      into     syntaxTree.ml      and
	syntaxTreeCore.ml. The idea is that lic2loc should be able to
	use syntaxTreeCore.ml verbatim.

src/lxm.ml
src/lxm.mli
	remove pack_name from  this module, so that it  can be shared
	with  lic2loc too  (this is  mandatory  since it  is used  by
	SyntaxTreeCore)

src/compile.ml
src/compiledData.ml
src/evalConst.ml
src/evalConst.mli
src/evalType.ml
src/evalType.mli
src/expandPack.ml
src/lazyCompiler.ml
src/main.ml
src/parser.mly
src/symbolTab.ml
src/symbolTab.mli
src/syntaxTab.ml
src/syntaxTreeDump.ml
src/syntaxTreeDump.mli
src/test/Makefile
src/test/packs.lus
src/test/test.res.exp
	opening SyntaxTreeCore  module, and inline  the definition of
	Lxm.pack_name.

	Also,  begin  to  replace  oper  by node  or  predef_node  in
	identifiers, in order to get a more consistant naming scheme.

src/lxm.ml:
src/global: (new file)
   Add the lustre file name in error messages.

src/compiledData.ml:
   Better Data structure dumping (string_of_type_eff,string_of_const_eff),
   and more dumping (LazyCompiler.check_const_interface).

src/lazyCompiler.ml:
   Fix a bug that prevented enum constants to be exported.
   Indeed, in LazyCompiler.const_check_interface_do, only extern
   constants (Extern_const_eff) were accepted in the provided part, whereas
   enum contants (Enum_const_eff) should also be accepted.

   Force constants interface checking in LazyCompiler.test.

src/test/Makefile:
src/test/onlyroll.lus:
src/test/heater_control.lus:
src/test/pfs.lus:
   Some more test files.

	Try to split this 400 lines (!) function.
	+ Factorize some duplicated code.

Ident.t is now an abstract data type (instead of a string).
fullid is turned into an Ident.long, and is also made abstract.

Add basic regression tests.

Add "assert false" statements everywhere it was necessary.

Add the fby operator in the syntax.