kprintf update

[Sascha Wildner]

Hi,

please review and test this patch which brings in some code from FreeBSD 
to kprintf (support for %j, e.g.):

http://leaf.dragonflybsd.org/~swildner/kprintf.diff

The commit message would be:

===================
- addlog(...) is identical to log(-1, ...). Get rid of it to avoid
  duplicate code and change sppp(4) to use log(-1, ...).
- Add support for the 'j' and 't' size modifiers.

- Add support for the 'i' (alias for 'd'), 'n' and 'X' conversions. Use
  uintmax_t in ksprintn() and get rid of ksprintqn(). Do some structural
  cleanup in kvcprintf().
- Make 'z' modifier always print values as signed.

- Change a return to a break to properly free the local buffers.

- When padding with zero, do pad after prefixes rather than before.

- Perform some style(9) cleanup.

Taken-from (with some adjustments): FreeBSD
===================
If there are no objections, I'll commit it within the next 2-3 days.

Sascha

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