- 4.08.0 messes up dynlink, which is needed by extlib for semi-good reasons:
  it is currently impossible to load the printers in this version.
- 4.09.0 and upwards directly load dynlink, and will complain if we try to
  do that again.

       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