- Mention code-cleanup possibilities in TODO.

TODO

@@ -233,3 +233,14 @@ Minor stuff:
     if(!ioctl (fd, WDIOC_GETTIMEOUT, &tmo)) timer_duration = 1 + (tmo / 2);
   Unfortunately, that needs linux/watchdog.h and that contains unfiltered
   kernel types on some distros, which breaks the build.
+
+
+Code cleanup:
+
+Replace deprecated functions.
+
+bzero() -> memset()
+---
+sigblock(), siggetmask(), sigsetmask(), sigmask() -> sigprocmask et al
+---
+