[e-acsl] the type system is now working: no more GMP in practice :-D

src/plugins/e-acsl/TODO

src/plugins/e-acsl/env.ml

src/plugins/e-acsl/env.mli

src/plugins/e-acsl/quantif.ml

src/plugins/e-acsl/quantif.mli

src/plugins/e-acsl/tests/e-acsl-runtime/addrOf.i

src/plugins/e-acsl/tests/e-acsl-runtime/arith.i

src/plugins/e-acsl/tests/e-acsl-runtime/at.i

src/plugins/e-acsl/tests/e-acsl-runtime/cast.i

src/plugins/e-acsl/tests/e-acsl-runtime/function_contract.i

src/plugins/e-acsl/tests/e-acsl-runtime/integer_constant.i

...gins/e-acsl/tests/e-acsl-runtime/oracle/addrOf.res.oracle

...ugins/e-acsl/tests/e-acsl-runtime/oracle/arith.res.oracle

src/plugins/e-acsl/tests/e-acsl-runtime/oracle/at.res.oracle

...lugins/e-acsl/tests/e-acsl-runtime/oracle/cast.res.oracle

.../e-acsl/tests/e-acsl-runtime/oracle/comparison.res.oracle

.../tests/e-acsl-runtime/oracle/function_contract.res.oracle

src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_addrOf.c

src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_arith.c

src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_at.c