Remove a lot of warnings (considered as errors by dune).

Indeed, having two different mechanisms is bad.

In the end, I've kept mine (and not the one of Pascal), because the
it was depending on LicPrg.t, which was creating a circular dep
(which could of course be fixed, but I am lazy).

More precisely, it was introduced here ea40dfa0
when addind the -enc option.

Indeed, in -ec, since them I've decided to only output the main
node. Hence when no main is specified, one was taken at random. But
it the chosen nide is a predef one, no code is generated !

To fix this, I now chose a user def node.

that expands the call of the specified node (can be used for several nodes).
Remove the previous --do_not-expand-nodes <string>

Also, the L2lExpandNodes pass now deletes the expanded nodes from the
current LicPrg.t.

itself calls another node on a non-trivial clock (i.e., using a when)
was not producing correct code.

I've fixed this by performing the fix-point on nodes rather than on
equations. Indeed its more natural and efficient, and it avoid the
problem above. However, I did not really fix the problem, but just
turn around it. All tests seems to work fine though.

nb : #FAILS=81->80 (and -2 unresolved, but because I fixed the prog)

As far as ldbg is concerned, it only traces the toplevel node, at
call event.

Note that I needed to rename quite a lot of modules to avoid name clashes
between lus2lic.a and ltop.

I've also merged the Verbose module with the one of Lutin so that
they can be shared (there were sharing 95% already).

Also Merge the Global and the MainArg module as they were
(bizzarely) both handling command args options.

Also call L2lCheckOutputs.check_node for all compiled nodes at the end
of all the l2l transfo.

nb: les tests ne passent toujours bien sur.

* Partie lus -> AST

predef.ml -> srcPredef.ml
syntaxTreeCore.ml -> astCore.ml
syntaxTree.ml     -> astV6.ml
syntaxTreeDump.mli-> astV6Dump.mli

* Partie Ast -> Ast

solveIdent.mli -> astRecognizePredef.mli
syntaxTab.mli -> astTab.mli
symbolTab.mli -> astTabSymbol.mli

* Partie  AST -> lic (static evaluation)

eff.ml  -> lic.ml
getEff.mli -> ast2lic.mli
lazyCompiler.mli -> licTab.mli
builtIn.ml -> licMetaOp.ml
predefEval*.ml -> licEval*.ml
name.mli -> licName.mli

* Partie Lic -> Lic

uniqueOutput.mli      -> l2lCheckOutputs.mli
structArrayExpand.mli -> l2lExpandArrays.mli
nodesExpand.mli       -> l2lExpandNodes.mli
doNoPoly.ml           -> l2lRmPoly.ml
doAliasTypes.ml       -> l2lAliasType.ml
doSplit.ml            -> l2lSplit.ml

- plus de macros prefefinies (e.g. FILL, BOOLRED etc...)
  (remplacé par la notion de BuiltIn)
- split.ml adapté et remanié pour rentrer dans le moule
  source to source (voir DoSplit)