By redirecting the stderr of ecexe onto stdout, ecexe now terminate properly when called from lurette.

Hence, I have no more unresolved test (they are now failures) and the exec
time is now 98s (versus 217!!)

Some failures were actually due to wrong programs (mved to should_fail/semantics)

nb : the change has actually been done in lurette.

when the arity of an alias node was wrong.

Indeed, I've intentionally removed the when statements in clocked local var like this :

 var
    v:int;

because the following was producing a syntax error in ecexe:

 var
    v:int when c;

But Actually, the right thing to do was to generate the following:

 var
    (v:int) when c;

...

nb : #FAILS=90->89

I took the data type definition from SocExecValue to define a Data
module that is a strict extension of the Lutin Data module.

The duplicated Genlex module is now also identical to the one of
Lurette.

Quite boring, but simple thanks to the ocaml type system.

 - translate merge on bools in terms of current and ite
 - do not print the clock info in node profile in en mode

+ various fixes in lustre test files.

nb : now all tests in the should_work dir passes !!!

Also, force the merge to operate over an ident rather than on any val_exp.

nb : do not work for lv4/ec mode

Also fix some bugs in DumpLic when printing condact in other modes.

nb : I've transformed all the regressions I've seen into todo entries
in todo.org.

nb 2 : I did not mv the newly broken tests into the broken dirs. I'll
do that for those I do not want to fix in the short term.