Can't use unsigned numbers as arguments for kprintf, klog etc.

[coditva]

klog(LOG_INFO, "this: %d", 123); prints garbage.
Also, need to change %x modifier to print hex.

[coditva]

All of the above are fixed. But. We have another bug which prints garbage when size of hex number is large.

[coditva]

That is fixed too. But. We have another bug which creates problems with signed numbers. I can't deal with this shit right now because I don't need to. Laters!
Some work for it in branch fix_putd.