christos f600368b8f Provide hooks for signal number to name translation, and use them for kill
and PSIG.

XXX[1]: This shows that signal emulation ktrace is slightly busted: posted
	signals should really be translated to the emulated ones instead of
	producing ktrace records with the signal numbers of the native
	emulation.
XXX[2]: There are other places where signal names can be displayed, but this
	is not done yet.
2002-03-31 22:44:03 +00:00
..