fix function Translate.term_to_exp used by plug-in Cfp. This fix requires to call the type system with no context in some cases

[typing] fix bug in on-the-fly typing when translating quantification
[typing] update a few oracles

  - add some missing cases in the new one
  - fixes several bugs
  - still all the test cases are not ok

[E-ACSL] add missing test

[E-ACSL] fixed bug with global declarations involved in the memory model (btw fixed but #1392)
[E-ACSL] additional feedback messages

[E-ACSL] visit E-ACSL's library files slightly faster

[E-ACSL] do not preprocess files twice

[e-acsl] generate nice variable names whenever possible

[e-acsl] bug fixed in functions with both a postcondition and multiple returns

* fixes bug:
  - fixed bug in quantifications when the bound variable got C type
  - fixed bug with DEV_FLAGS in Makefile.in
* implements new E-ACSL features:
  - invariant as assertion
  - existential quantification \exists over integers
  - equivalence <==>
  - \at as a predicate
  - conditional _ ? _ : _ (for terms and predicates)
  - binary boolean operations over terms
  - mixed assumes and ensures in function contracts
* other new features:
  - better error messages when runtime checks fail 
    (replace e_acsl_fail by e_acsl_assert)
  - remove option -e-acsl-assert
  - add E-ACSL manuals in doc/manuals
  - add files doc/Changelog, INSTALL, README and VERSION
  - new option -e-acsl-version
  - check Frama-C version at configure
  - make src-distrib
  - header 2012