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bug, refactor, test: make pragma history_length work interactively

history_length could be set interactively, but it was never used to set
readline/pyreadline3's internal state. Using the pragma setting on the
roundup-admin command line did set readline's state.

Also refactored 2 calls to self.readline.get_current_history_length()
into one call and storing in a variable. Also changed method for
creating history strings for printing.

Tests added for history_length pragma on cli and interactive use.

Added test for exiting roundup-admin with EOF on input.

Added test for 'readline nosuchdirective' error case.

Added test to readline with a command directive to set an internal
variable. This last one has no real test to see if it was successful
because I can't emulate a real keyboard/tty which is needed to test.

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