BUF/BIO command separation patch #1

[Matthew Dillon]

    I would appreciate it if a few people could go over this patch set
    and even test various aspects of it.

	fetch http://apollo.backplane.com/DFlyMisc/bufcmd01.patch

    What I am doing here is separating out the BUF/BIO command into
    its own field, b_cmd, and removing all the command flags from 
    b_flags.

    I especially need testing of the floppy driver, MFS, VN, and an
    ATA raid.  It is a fairly straightforward patch and I have a ton of
    other surgery to do so I am slating the commit for Sunday.

						-Matt