Log Message:
Update to 0.4.6:

The changes between release 0.4.5.1 and 0.4.6 include, among other things:

o)  NetBSD/pmppc can now run in the emulator (with root-on-nfs), on
    an emulated Artesyn PM/PPC board.

o)  An instruction combination has been implemented for the idle loop
    used by NetBSD/arm (cats, netwinder, and iq80321). In plain English,
    this means that if the guest OS inside the emulator is not using
    any CPU, the emulator should not use much CPU on the host either.

o)  Some minor SuperH emulation speed improvements.

o)  General code cleanup: Non-working (skeleton) emulation modes have
    been removed, to make it easier to maintain the source code in
    the long run, and many unused/legacy constructs have been removed.