- Bump __FreeBSD_version after recent callout(9) changes.

- Add an entry in UPDATING to notice users about breakages.

UPDATING

@@ -27,6 +27,12 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 10.x IS SLOW:
 	"ln -s 'abort:false,junk:false' /etc/malloc.conf".)
 
 20130304:
+	Recent commits to callout(9) changed the size of struct callout,
+	so the KBI is probably heavily disturbed. Also, some functions
+	in callout(9)/sleep(9)/sleepqueue(9)/condvar(9) KPIs were replaced
+	by macros. Every kernel module using it won't load, so rebuild
+	is requested.
+
 	The ctl device has been re-enabled in GENERIC for i386 and amd64,
 	but does not initialize by default (because of the new CTL_DISABLE
 	option) to save memory.  To re-enable it, remove the CTL_DISABLE

sys/sys/param.h

@@ -58,7 +58,7 @@
  *		in the range 5 to 9.
  */
 #undef __FreeBSD_version
-#define __FreeBSD_version 1000028	/* Master, propagated to newvers */
+#define __FreeBSD_version 1000029	/* Master, propagated to newvers */
 
 /*
  * __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,