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

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.

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

IDENT remplacé par VAR_REF/CONST_REF
- plus de node_exp dans les CALL, juste une ref (node_key)
- reste a faire pareil pour les NodeStaticArgEff