upon "read" of a short line, assign all variables passed as arguments.

It was noted that (print 1 2 | read one two three four) assigned values
only to $one and $two except in the case where EOF was reached.
31417: age function needs protection against file names starting "-"
Fix merge
Omitted ChangeLog entry for previous commit
31418: improve documentation for "age" function
31419: Add time zone and year to string formatted time output from zstat
31405: weasel words about PRINT_EXIT_STATUS option.