lock and jobserver acquirings/releases
* displaying of each target's execution time
* each target's stderr can be displayed with the PID
+* optional statusline with currently running/waiting/done jobs
* target's stderr can be stored on the disk with TAI64N timestamp
prefixes for each line. To convert them to localtime you can use either
tai64nlocal utility from daemontools (http://cr.yp.to/daemontools.html)