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encoding_sort   : identity on meta lsymbol without definition
                  undefined symbol are defined before using them...

courses  WP_registerStudent : 0.53 s -> 0.03!!

- 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.

- 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.

traitemant des triggers dans encoding decorate (des cas pathologiques peuvent aboutir a des quantifications non totales

printer : print_prelude inside printers instead of prover.ml. Required for smt which has its own prelude.

default actions in case explicit options are missing.

The command line has the following structure:
    
    why [options] [[file|-] [-t <theory> [-g <goal>]...]...]...

Summary:
    
    Qualified theories come from the library, not from file.
    When the driver is not specified, pretty-print theories.
    When neither --prove nor --output are given, print tasks.
    When no theory is specified for a file, use every theory.
    When no goal is specified for a theory, use every goal.

Examples:

    % why.opt
    [shows usage information]

    % why.opt test.why
    [prints the contents of test.why]

    % why.opt -t int.Int
    [prints the library theory int.Int]

    % why.opt -D drivers/z3.drv test.why
    [sends every task from test.why to stdout]

    % why.opt -D drivers/z3.drv -o directory test.why
    [creates ./directory/ if it's does not exist and
     sends every task to a separate file in ./directory/]

    % why.opt -D drivers/z3.drv --prove test.why -t ThA
    [calls the prover for every goal from theory ThA in test.why]

    % why.opt -D drivers/z3.drv --prove test.why -t ThA -g G1 -g G2
    [calls the prover for G1 and G2 from theory ThA in test.why]

    % why.opt -D drivers/z3.drv -t int.Abs -g G1 test.why -t ThA
    [prints G1 from int.Abs and every goal from ThA in test.why]

It's not more expressive but much nicer than epsilon.

Interface consistency is god.