Add configuration option to notify all appointments

If "notify-all" is enabled, all non-flagged appointments will be
notified (instead of flagged ones). This is useful for users that want
to be notified of everything.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

src/calcurse.h

@@ -466,6 +466,7 @@ struct nbar {
   char             timefmt[BUFSIZ];  /* format for displaying time */
   char             cmd[BUFSIZ];      /* notification command */
   char            *shell;            /* user shell to launch notif. cmd */
+  unsigned         notify_all;       /* notify all appointments */
   pthread_mutex_t  mutex;
 };