sys_timer accumulates timer ticks into seconds, minutes, hours and days.
It's left to the user to calculate from days into a date. It is not yet
known if the calculation is even roughly correct.
Reduced 2 kmem_reclaim/grant calls into one kmem_control call.
Paging-in requests seem to work.
TODO:
- Remove far/fsr information in pager and abstract away these details in c0.
- Add a npages field to page fault ipc so that multiple pages can be paged-in.
Added routines that check whether a user pointer is accessible by the kernel,
and if not ask the pager to map-in those pages. I haven't implemented yet the
bit that asks the pager for paging-in.
