replacing umlaute and fixing address in headers Haldeneggsteig -> Universitaetsstrasse

Signed-off-by: Reto Achermann <reto.achermann@inf.ethz.ch>

Refactoring core boot-up logic in kernel.

Move architecture independent logic into single arch-independent
syscall for all platforms. Handle arch specific boot-up with
specialized function (usually defined in start_aps.c).

Initial version of public stable barrelfish repository.