Major release with tons of improvements

- Minor fix, sigemptyset(&emptymask)
    - Mostly consists of major code changes.

Great thanks to Simon Lieb (pips-) for his help.

config.mk

@@ -1,5 +1,5 @@
 # spt version
-VERSION = 0.3
+VERSION = 0.4
 
 # Customize below to fit your system
 

spt.c

@@ -150,6 +150,8 @@ main(int argc, char *argv[])
 	if (sigaction(SIGUSR2, &sa, NULL) == -1)
 		die("cannot associate SIGUSR2 to handler\n");
 
+	sigemptyset(&emptymask);
+
 	for (i = 0; ; i = (i + 1) % LEN(timers)) {
 		notify_send(timers[i].cmt);
 		remaining.tv_sec = timers[i].tmr;