Allow users to set manually a quantity of items to display in a tree view
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Functionality:
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    * By default, in Odoo, user can display 80 / 200 / 500 / 2000 elements in
    a tree view;
    With that module, user can select a custom number of items to display;

Technical information:
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    * replace a select element by an input with datalist option. That allows
      to set a custom value, or to select an option. (same options as before:
      80 / 200 / 500 / 2000 / unlimited);

    * WARNING: 'Datalist' is a HTML5 tag; If your browser is not HTML5
      compliant, the options will not be displayed (but it is possible for
      user to select manually a value);
      See browser Support: http://www.w3schools.com/tags/tag_datalist.asp

Roadmap:
--------
    * When pressing Esc key, it could be user friendly to return to the
     previous state (before editing the quantity).

Copyright, Author and Licence:
------------------------------
    * Copyright:
        * 2015-Today, Akretion;
    * Author:
        * Sylvain LE GAL (https://twitter.com/legalsylvain);
    * Licence: AGPL-3 (http://www.gnu.org/licenses/)