joomla/joomla-cms — pull request #2646 by infograf768 (2013-12-05 06:50:51+00:00)
Title: Reverting not allowing spaces in username

http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=32883&start=0

replaces https://github.com/joomla/joomla-cms/pull/2643