KKASSERT improvements

[Adam Hoka]

Hi!

I am using this little modification to make failing assertions easier to debug:

http://leaf.dragonflybsd.org/~ahoka/kkassert.diff

It basically adds file/line number to the panic message with little bit
of improvement in the wording. Im wondering if its useful and could get
committed.

Thanks.

-- 
NetBSD - Simplicity is prerequisite for reliability
Software Engineering Department, University of Szeged