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.

<!-- query.item -->
<span tal:condition="context/is_view_ok" tal:replace="structure
      context/renderQueryForm" />
<tal:block tal:condition="not:context/is_view_ok">
  <tal:block metal:use-macro="templates/page/macros/icing">
    <title metal:fill-slot="head_title">You can not view query</title>
    <tal:block metal:fill-slot="body_title">
      You can not view query.
    </tal:block>
    <td class="content" metal:fill-slot="content">
      You are not allowed to view <span tal:content="context/_classname"/>
      with id <span tal:content="context/id"/>
    </td>
  </tal:block>
</tal:block>