[Svn] [roundcube/roundcubemail] a8d554: Update idn convertion methods (#6115)

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/roundcube/roundcubemail
  Commit: a8d554716379056198e1b65274dc733bbcd45d5f
      https://github.com/roundcube/roundcubemail/commit/a8d554716379056198e1b65274dc733bbcd45d5f
  Author: Daniel Kesselberg <mail at danielkesselberg.de>
  Date:   2017-12-31 (Sun, 31 Dec 2017)

  Changed paths:
    M program/lib/Roundcube/rcube_utils.php
    M tests/Framework/Utils.php

  Log Message:
  -----------
  Update idn convertion methods (#6115)

* Add more test cases
* Update phpdoc