make duration work off monotonic clock in Time::HiRes, for higher reliability
cleanup a bunch of formatting and data in Log::Work::Log4perl
try to be smrter about automatically removing/getting UOWs
change PVID generation to use time and a counter that resets when time increments, rather than time and rand and an ever-increasing counter
add pid to UOW so a child PID will not attempt to use an inherited UOW (though those UOWs can be passed to children with yield/claim)