Allow for stdin input to rt shell action. #1
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This makes it possible to more easily script bulk operations for RT by allowing to read from STDIN instead of the tty when STDIN is NOT connected to a tty.
For example, this now works:
rt ls -t user -i | sed 's/user/show user/' | rtand is aproximately two times faster than
rt ls -t user -i | while read a;do rt show $a;done