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[trywhy3] Allow one to compile trywhy3 with debugging information and source map file by passing DEBUGJS=yes to make.

Dummy C printer added

Attempt to make it generic, using registered extraction functions

Compiles but not working yet

now correctly updates the examples contained in sub-directories

We added the generation of identifiers for counterex values inside the
printer of altergo.
Also added a file to factorize counterex printing functions that are used
for both altergo and smtv2.

* Makefile.in
(cntexmp_printer): Factorization file added to Makefile.

* src/driver/parse_smtv2_model_lexer.mll
(MODEL): Adding model keyword.

* src/driver/parse_smtv2_model_parser.mly
(output): Added parsing when keyword model is at beginning of the
 output of the prover.

* src/printer/alt_ergo.ml
Adding info mimicking smtv2.ml inside most printing functions for counterex
generation.

* src/printer/cntexmp_printer.ml
Common functions to alt_ergo.ml and smtv2.ml

* src/printer/smtv2.ml
Removed functions that are factorized into cntexmp_printer.ml

Moreover, this commit also performs the emacs compilation at build time
rather than install time. It also uninstalls why3.elc systematically.

The main issue is that both ocamlc and ocamlopt write a .cmi file when
there is no .mli file, so the .cmi file might end up being corrupted due
to concurrent accesses.

The ugly fix is to prevent ocamlopt from creating a .cmi file by lying to
it: ".mli files are no interface files, .but cmi files are". So ocamlopt
behaves as if there had been a .mli file in the first place and does not
try to produce a compiled interface from the .ml file. Note that we use
the .cmi file because it happens to have the same base name, but any other
file would have worked, e.g. the .dep file, since ocamlopt does not even
read the file to check that it is actually an interface file.

Since ocamlopt now believes that the .ml file has an interface, it needs a
compiled interface to check its signature against, so the .cmi file has to
be created beforehand. So the .cmx file is made to depend on the .cmi file
and the .cmi file on the .cmo file.

This might seem to add a dependency from the opt build on the byte build,
but since ocamldep already says that the tools depend on lib/why3/why3.cmo
due to the pack, this does not make the situation any worse.

Note that there is a single file for which the .cmi hack cannot be used:
src/tools/why3extract.ml. Indeed, if we lie to ocamlopt, it will try to
use lib/why3/why3extract.cmi as the compiled interface (?!) and thus fail
to compile src/tools/why3extract.ml, obviously. So the hack is disabled
for this file, which means that src/tools/why3extract.cmi could end up
being corrupted, but we do not care.

This reverts commit 6031de02.
Rationale: .cmxa files are not sufficient for cross-module optimizations.

Autoconf mandates an install-sh shell script. It can be installed using
"automake --add-missing" when working from the git repository.

	  trywhy3.html from the local filesystem instead of loading it
	  from a web server). Only tested with firefox and chrome.