[Makefile] Renamed e-acsl-runtime and e-acsl-reject test directories to runtime and reject respectively

[tests] update oracles according to various recent kernel changes

[E-ACSL] fix typing bug with divisions/modulos over floats

[E-ACSL] improve ACSL contracts of its libraries
[E-ACSL] no more unknow locations in translation of quantifications

[E-ACSL] my previous tentative patch did not work. I prefer to have E-ACSL that works than non-regression tests...

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

[E-ACSL] code of e_acsl_assert put in e_acsl.c (no more in e_acsl.h)

[E-ACSL] convert postcondition even in presence of untranslated assigns clause
[E-ACSL] fix bug when the translation of a predicate containing \at is abruptely stopped because of a not-yet-implemented construct (the generated code contained undeclared __e_acsl_at variables)