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full tail rec algo abandoned (for the time being)

- Add an option to specify the dir where to put generated C files in.
- Propagate all lutin options in the C part that fork the lutin interpreter
(-rif, -precision, -node, -boot)
- use the Sys.argv.(0) as the lutin interpreter to be called (to make sure
the same lutin is used and to be able to specify the full path in the C
file if needed).

- Split check-rif.ml into check-rif.ml and coverage.ml.
- Add a section dedicated to check-rif in the Lutin manual, in the tool section.
- Use the ocaml Arg module to deal with command-line args.
- Take advantage of the fact that an ec file only have one node.
- Store/update the corevage info in a .cov file

was too small.

The idea is that Rif_base does not depend on any other module while
Rif keeps its interface but relies on Rif_base for its implementation.

Propagate some changes in the gnuplot syntax in gnuplot-rif. This will break old version of gnuplot. Sigh. Also, make -wxt the default behavior of gnuplot-rif.

Fix a bug (probably introduced in 0b0203fe) where the path of the env file was not explicit which prevent Makefile.lurette to find it. \n ps : it is no more possible to use a list of file in the env slot ; but who cares now that Lutin is usable from Lurette?

deterministic subset seems to work

Conflicts:
	source/Lutin/Makefile.lutin
	source/Lutin/main.ml

Fix a bug (in LucFGen) where the exception Invalid_argument("Random.int") was raised on some Lutin programs.

It was occuring when all outgoing transitions were labelled by the
null weigth.

instead of lucky.a to launch the lutin interpreter.

I've added a test in the example/lutin/C/ directory.

in order to avoid strange "assert" behavior.
Simu is based on standard AutoGen, thus
the behavior is the same with simu and compiled luc.
Warning: the experience of AutoExplore raised
important problems between Lutin and Lucky semantics:
should be fixed in a later version !

using the RIF format.

Also, add a --2c-4c that does the same job as luc2c without option.

FGen module is made abstract, old one renamed in LucFGen
Bug fixed in Lutin.Expand

Also, make sure that a git clone result in a working (build, test) setup.

i.e., loop 42 is equivalent to loop [42,42]