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also, add some (*commented*) memoization debugging output

- bring driver syntax closer to that of theories
- some simple API improvements

- everything is converted to the new shiny way of doing things.
  Well, everything except Gappa, which seems very unifinished anyway,
  and Encoding_instantiate, which is too complex and would like to 
  update it with François.

Also, I commented a little piece of exception reporting in manager/,
will see it with Claude.

THIS IS STILL A WORK IN PROGRESS!
Please inform me about any bugs, ugly APIs, and proposed corrections.

All the non-implemented things, mentioned in the previous commit
message are still in the TODO list and will be done soon.

- dependent transformations (ones that depend on cloning history
  and/or metaproperties) have now the same type Trans.trans and
  can be registered via Trans, too.
- load_driver accumulates appropriate tdecls to be appended to
  tasks before transformation/printing.

At this moment, we have almost everything in place and are ready
to remove Register module (subsumed by Trans and Printer in core/)
and Prover module (its functions will move to Driver), and convert
all printers and transformations to use the new infrastructure. 

Not implemented yet:
- appending driver-imposed tdecls to tasks - when and where?
- metas-options - what is the best way to implement them?
- syntax/typing for metas in theories and drivers.

- introduce a new Theory.tdecl "Meta" to be used for tags
- simplify cloning procedure, get rid of the th_clone field
- when a goal proposition is discarded during cloning, 
  it's still keeped in the theory as a "skip proposition",
  this is needed to preserve/clone every local identifier.
  Skip propositions are eliminated during task formation.
- get rid of a separate Task.tdecl type
- reorganize the Task.task_hd record:
  * use/clone history is cached in a theory-keyed map;
  * meta-properties are cached in a tagname-keyed map.
  This is done to simplify the fine-grained configuration
  of transformations.

- convert Trans and Register to use weak memoization

Driver : fix compose dans le bon sens

- apply transformations in Driver at print_task/prove_task

- accept timeout regexps in drivers
- do not take command line from drivers

- no more version.sh, use config.ml.in and version.tex.in instead
- dynlink compatibility is moved to config.ml
- comment out unused sections in Makefile
- provide the explicit --enable-ide option
- provide the explicit --enable-plugins option
- require at least Ocaml 3.10
- remove *-yes and *-no targets from Makefile,
  use ifeq() instead

This will allow transformations to apply use and clone.
Also, this will allow to simplify the driver structure.
Memoisation modulo env/clone/use requires some further 
adaptation (but this would be needed anyway).

   driver.ml : Rattrape TheoriesNotFound
   bench.in : Test jusqu'au bout les drivers
   drivers : corrige le nom des théories
   
TODO modifier driver_parser pour prendre (+) au lieu de (_+_)

   - Util : Ajout de Creation generique de Set,Map et Hashtbl 
            quand on a un tag et une egalitée physique
   - Hashweak : Implementation de l'idee de Jean-Christophe et Andreï
   - Register : Simplification des types comme demandé par Jean-Christophe
                Mise à jour des fichiers qui en dépendait
   - Theory   : Ajout d'une facilité de création des th_inst
   - Encoding_decorate : Prelude pour l'encodage de Stéphane en utilisant flat_theory d'Andreï
   - Ty : Ajout de Sty, Mty et Hty
   - Main : Reduction de la taille des lignes à 80 colonnes