935 hw: move kernel.cc to core/kernel/
935 hw: get rid of kernel_support.cc
935 base: individual implementations of pager-object
935 hw: belatedly assign signal contexts in kernel
935 fixup "hw: handle interrupts via signals"
935 hw: belatedly assign signal contexts in userland
935 core: provide signals before other services

Provide core-local signal service before other services to enable the use
of signal connections while initialzing the other services. This has been
introduced due to the use of the signal framework by the pager lib in
base-hw (RM service).
935 tmp hw: prototype for signal-handled pagefaults
935 tmp hw: get rid of xxx syscall
935 tmp hw: get rid of yyy syscall
935 tmp hw: pager object as signal context with appropriate ID
935 tmp hw: Pager_activation_base as Signal_context
935 tmp hw: assign fault context via Signal_receiver::manage
935 tmp hw: get rid of Kernel::Thread::_pf_receiver
935 tmp hw: use signal-context ptr as fault imprint
935 tmp hw: end faults via signal framework also
935 tmp hw: get rid of Kernel::set_pager
935 tmp hw: shrink Ipc_pager and Pager_* classes
935 tmp hw: beautify paging framework a bit more