Custom html module "basic" options hard to find

The Options are now displayed below the editor textarea and may not be seen by the user.
This patch adds a tab for them. 

http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=32401&start=0


![modcustomoptions](https://f.cloud.github.com/assets/869724/1391755/a759bcca-3c01-11e3-8355-3dab341d7e3b.png)