libc: add clock_getres()/clock_gettime() system calls.

In order to make it more clear that ticks should be used for timers
and realtime should be used for timestamps / displaying the date/time,
getuptime() was renamed to getticks() and getuptime2() was renamed to
getuptime().

Servers, drivers, libraries, tests, etc that use getuptime()/getuptime2()
have been updated. In instances where a realtime was calculated, the
calculation was changed to use realtime.

System calls clock_getres() and clock_gettime() were added to PM/libc.

kernel/system/do_times.c

@@ -36,6 +36,7 @@ int do_times(struct proc * caller, message * m_ptr)
       m_ptr->T_SYSTEM_TIME = rp->p_sys_time;
   }
   m_ptr->T_BOOT_TICKS = get_monotonic();  
+  m_ptr->T_REAL_TICKS = get_realtime();
   m_ptr->T_BOOTTIME = boottime;  
   return(OK);
 }