PR 1466/tests
* Makefile.am, configure.ac, psxclock/init.c, psxclock/psxclock.doc,
psxclock/psxclock.scn, psxkey03/init.c, psxsignal02/init.c,
psxsignal03/init.c, psxstack01/init.c: Remove usleep() from tests.
Add test specifically to test it since it is deprecated as of
POSIX.1-2008.
* psxusleep/.cvsignore, psxusleep/Makefile.am, psxusleep/init.c,
psxusleep/psxusleep.doc, psxusleep/psxusleep.scn: New files.
