Taking care of symbols defined in httpd.c
Taking care of symbols defined in save.c
Taking care of symbols defined in kzapisz.c
Taking care of symbols defined in mp_wyzw.c
Taking care of symbols defined in mp_pol.c
Taking care of symbols defined in mp_wczyt.c
Taking care of symbols defined in mp_wyr.c
Taking care of symbols defined in interp.c
Taking care of symbols defined in nanny.c
const.c-related improvements.

Taking care of symbols.
Adding const qualifier where applicable and easy. This is first pass.