Updated test0 with a forktest. Fixed timeslices. Updated kmem usage calculations.

- test0 now forks 16 tasks that each modify a global variable.
- scheduler now gives 1/10th of a second per task. It also does not increase timeslice
  of a task that has scheduled.
- When a memory is granted to the kernel, the distribution of this memory to memcaches
  was calculated in a complicated way. This is now simplified.

tasks/test0/include/tests.h

@@ -4,6 +4,7 @@
 #define __TASKNAME__			"test0"
 
 int shmtest(void);
+int forktest(void);
 int mmaptest(void);
 int dirtest(void);
 int fileio(void);