[elysium-cvs] Support for paging added

[Kasper V. L. <ve...@da...>]

I've added support for paging to the Elysium kernel. The function
'memory_init()' now initializes a base page directory, and CR3 is set to
point to this page directory before paging is finally enabled. Notice
that writing to read-only pages - even from kernel mode - will cause
page faults.

/Kasper