Unified "sleep" functions to "octave_sleep" in C++ and "pause" in Octave. * doc/interpreter/system.txi: removed sleep and usleep from doc. * libinterp/corefcn/sysdep.cc (pause): updated docstring. * libinterp/corefcn/sysdep.cc (sleep): moved to deprecate sleep.m. * libinterp/corefcn/sysdep.cc (usleep): moved to deprecate usleep.m. * scripts/deprecated/sleep.m: moved here from sysdep.cc. * scripts/deprecated/usleep.m: moved here from sysdep.cc. * scripts/deprecated/module.mk: add sleep.m and usleep.m to build system. * NEWS: deprecation news for sleep and usleep. * libinterp/corefcn/data.cc: examples updated. * libinterp/corefcn/syscalls.cc: examples updated. * scripts/audio/@audioplayer/audioplayer.m: examples updated. * scripts/audio/@audiorecorder/audiorecorder.m: examples updated. * scripts/plot/util/ginput.m: examples updated. * scripts/plot/util/private/__gnuplot_get_var__.m: use pause. * scripts/plot/util/private/__gnuplot_ginput__.m: use pause. * libinterp/corefcn/utils.cc (octave_sleep): Unified "sleep" functions here. * libinterp/corefcn/utils.h: removed header cutils.h. * libinterp/corefcn/graphics.cc (drawnow): use octave_sleep. * libinterp/corefcn/graphics.cc (waitfor): use octave_sleep. * libinterp/corefcn/toplev.cc (clean_up_and_exit): use octave_sleep. * libinterp/corefcn/cutils.c: removed no longer needed code. * libinterp/corefcn/cutils.h: removed no longer needed header. * libinterp/corefcn/matherr.c: removed orphaned code. * libinterp/corefcn/module.mk: removed cutils.h, cutils.c, and matherr.c from build system.

--- a/libinterp/corefcn/toplev.cc	Wed Dec 16 16:47:18 2015 -0800
+++ b/libinterp/corefcn/toplev.cc	Thu Dec 17 16:04:13 2015 +0100
@@ -800,7 +800,7 @@
           // exiting for us.  Assume that job won't take more than a
           // day...
 
-          gnulib::sleep (86400);
+          octave_sleep (86400); // FIXME: really needed?
         }
     }
   else