commented, corrected and beautified both timer and timer group code

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@1136 3ae390bd-cb1e-0410-b409-cd5a39f66f1f

timer.h

@@ -28,6 +28,7 @@
 #ifndef _TIMER_H_
 #define _TIMER_H_
 
+
 int timer_add(void (*callback) (void *data), void *data, const int interval, const int one_shot);
 
 int timer_add_late(void (*callback) (void *data), void *data, const int interval, const int one_shot);