- Generate code for most predef operators.
- Generate a loop.c file (in a similar manner as ec2c -loop does)

Add the modes3x2 exemple of Pascal (its version + a la V6 version).

Fix the doc wrt the merge exemple (the tex was refering to a
non-existant file).

Instead, print a warning and consider the input as unbound.
Is it really the right thing to do?

More specifically, replace @ by rev_append and flatten+map by fold_left.

On a file that has 11000 equations (normal.ec), I win a factor 4: 60s -> 15s

The main difference is that I use a map instead of list to store
visited nodes.  The compilation time of normal.ec is divided by 2!!
(35s->15s)

We do not really see the difference in the time of the non-reg tests
since the execution of normal.ec still exceeds the 10s timeouts.

That was quite confusing for rdbg -lurette --*-stdio !!!

nb : programs do run, but I did not check that they run correctly...

Also fix a regression introduced in the previous change where
incorrect ec code was generated for diese.

BTW, put everything that concerns node environement into the new
IdSolver module (from the Lic module).

The only culprit was the one in unifyClock.ml::249, but
I've lazyfied most of the non-trivial verbose call.

The 2 remaining unresolved testq that were timeout-ing now pass in a few ms...

The whole non-reg test time has been divided by more than 2!

 - 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.

Plug back the enums expansion (-ee, --expand-enums) that translates enum types using extern consts and types.

It was beacause the tables in LicVarName were cleaned and because the way
this module work sucks...

on programs containing equations such as :

    b3, b4, b5, b6 = (three_outputs(two_outputs(b1,b2),true), false);

because TUPLES where not correctly inlined (i.e., "...= n((x,y),z)" instead of "...=n(x,y,z)"

Also do not print type and const declarations with -ec.

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.