stats.c, userlist.c, whobbs.c: return type of main() is int
* citadel.c, commands.c, messages.c: use time_t properly
* citserver.c: include <limits.h>
stats.c, userlist.c, whobbs.c: return type of main() is int
* citadel.c, commands.c, messages.c: use time_t properly
* citserver.c: include <limits.h>