system/schedtool: Added to 13.0 repository

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+Schedtool interfaces with the Linux CPU scheduler.
+
+It allows the user to set and query the CPU-affinity and nice-levels of 
+processes, as well as all scheduling policies, like batch or real-time 
+(RR/FIFO) classes and their priorities.  It can be used to avoid skipping 
+for A/V-applications, to lock processes onto certain CPUs on SMP/NUMA 
+systems, or to adjust nice-levels of lesser important jobs to maintain a 
+high amount of interactive responsiveness under high load.
+
+All special scheduling classes of the -ck kernel patchset are also supported.
+
+Certain modes (as of this writing: SCHED_IDLEPRIO and SCHED_ISO) need a
+patched kernel; see the INSTALL file for details.