Only modifications introduced by non necessary casts elimination

Only differences comes from using float builtins in expr-to-term

According to the kernel option -warn-invalid-pointer.

Juste use `@@` as in `Format` 

also fixes list of `.ml` files in test directories belonging to the kernel

- Fix Value/Value#5
- Fix Value/Value#14

Some case studies (e.g. dyad) use some ugly casts from fd_set_t which lead
to the analysis stopping too early.
Changing the representation of fd_set_t should also help it better conform to
the standard (since a fd_set_t should be able to hold FD_SETSIZE elements).

[Ptests] preserve LOG after STDOPT directive

See merge request frama-c/frama-c!2073

This is absolutely not a sneaky attempt to relaunch a build (now that OCI seems
in better shape) pushing a nearly empty commit.