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/libmem/mm/alloc_page.h

@@ -25,7 +25,6 @@ void init_page_allocator(unsigned long start, unsigned long end);
 
 /* Page allocation functions */
 void *alloc_page(int quantity);
-void *zalloc_page(int quantity);
 int free_page(void *paddr);
 
 #endif /* __ALLOC_PAGE_H__ */