debug features in instrumented executables at runtime

This option allows to specify debug or production build of E-ACSL
runtime library.

them from scratch each time

option

Frama-C

distribution of the GMP library (mini-gmp) and the full GMP library at
build time

- Declare explicitely the presence of tests/print.ml
- Compile it as dependency of `ptest_config` rather than
  `E_ACSL_TESTS` (in the latter case, they might not be compiled when
  `ptests` is launched, because `ptests` is launched by
  `E_ACSL_DEFAULT_TESTS` which is itself a dependency of `E_ACSL_TESTS`).

Needed for changes introduced by frama-c/frama-c!930

    in Frama-C). Prefix library variables with EACSL prefix.

clean

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

Frama-C variables

contrib libraries

(bug introduced in !59)