Added the automatic generation of the boolean equality if possible and the

decidability of the usual equality
Major changes:
 * andb_prop & andb_true_intro have been moved from Bool.v to Datatypes.v 
 * added 2 files:
    * toplevel/ind_tables.ml* : tables where the boolean eqs and the
        decidability proofs are stored
    * toplevel/auto_ind_decl.ml* : code of the schemes that are automatically
        generated from inductives types (currently boolean eq & decidability )
 * improvement of injection: if the decidability have been correctly computed,
   injection can now break the equalities over dependant pair

How to use:
 Set Equality Scheme. to set the automatic generation of the equality when you
create a new inductive type
 Scheme Equality for I. tries to create the equality for the already declared
type I




git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@10180 85f007b7-540e-0410-9357-904b9bb8a0f7

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