Invisible aliases are not printed in the help message of the plugin or kernel.
Deprecated aliases emit a warning when used.

-explain also indicates if the option used is an alias for another option.

Uses a hashtbl from all option names to options, instead of browse all frama-c
options to find the ones from the command-line.

       Add migration script

(blind make headers from specifications)

- 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.