move stuff around so PageShift is defined before it is needed

move stuff around so PageShift is defined before it is needed
don't ever include a file while in a namespace
start of making alpha console new memsystem happy
Make a BasePioDevice which is what all the simple Pio devices will inherit from
add a description of when the data pointer will have memory

arch/alpha/isa_traits.hh:
    don't ever include a file while in a namespace
dev/alpha_console.cc:
dev/alpha_console.hh:
    start of making alpha console new memsystem happy
dev/io_device.cc:
dev/io_device.hh:
    Make a BasePioDevice which is what all the simple Pio devices will inherit from
mem/packet.hh:
    add a description of when the data pointer will have memory

--HG--
extra : convert_revision : 495c0915541f9cad3eb42891e60b4ecbee7952bf