Use new read/write_block0 and read/write_dpme which handle any

endian or alignment issues forcefully. Removes need for convert_*
functions so unhook convert.c from build. read/write_block become
static functions inside file_media.c.

Tweak struct block0 to stop trying to handle alignment issues by clever
declaration. Rely on the new functions to accurately translate between
on-disk and in-memory layouts.

Enables pdisk to work on amd64 and likely other architectures if
it's ever desirable. Does bring back DEV_BSIZE to pdisk.c since the
in-memory structure will *not* be 512 bytes on other archs.

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