merge ktrace-lwp.

Use FS_OPS() macro.

- implement putstr(), and use in various places instead of printf()
- wrap more debug stuff in #ifdef DEBUG
- for bootxx, provide minimal panic() which uses putstr() instead of printf()

bootxx is no

- implement putstr(), and use in various places instead of printf()
- wrap more debug stuff in #ifdef DEBUG
- for bootxx, provide minimal panic() which uses putstr() instead of printf()

bootxx is now < 7.5KB

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Added sources for the sun2 boot blocks and other
sun68k-ish code, all of which ought to eventually
be shared with the sun3.