Make the flush_time_randomizer_t never ask for a zero-second timeout.  Also made the timer_handler_t::add_timer_internal guarantee about such be an rassert.
Merge branch 'next' into sam_style
Merge branch 'sam_style' into sam_demock
Merge branch 'sam_demock' into sam_84
Tweaked the temp_file_t destructor a bit but it still seems broken.