to take inode* instead of minor number.

Unlock console inode during console_read
and console_write.  Otherwise background
processes cannot write to console while the
shell is reading it waiting for input.

There is only one ref to it -- the caller --
and no links to it.

Mainly delete unused constants and code.

Move mp_startthem to main.c as bootothers.

One initialization function now, not three.
Use #defines instead of enums (consistent with other code, but sigh).

Still boots in Bochs in SMP mode.