Basic Resource Manager.

RMGR is a very old package with functionality more and more replaced by the
L4 environment. Nevertheless, we still depend on some features of that good
old dog. The RMGR handles the following resources

- physical memory
- interrupts
- tasks
- small address spaces

Furthermore, the RMGR is responsible for starting the L4 kernel, the basic
servers of the L4 environment, among them the L4 loader.
