Fixed issue with fields splitting causing layout issues

http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=32636

For J3.2 I (under JUX team) implemented an automatic split of parameters over 2 columns when there are more than 10.
This will divide the params over 2 span6 divs.

However, this change sucks as it causes issues with some 3rd party devs and also makes it unclear when the split occurs between certain parameters that should stick together.

So this PR removes that split functionality that I put in.

#### Testing Instructions
See the settings for for instance the TinyMCE plugin and see how the settings get split in a non-logical place.

Also install a 3rd party plugin like http://www.nonumber.nl/extensions/tabs and see how this splitting thing causeslayout issues with custom field types.


PS: I have been discussing other methods to solve the issue this tried to solve, and would be in the form of sub-fieldsets which would get automatically grouped in - for instance - divs with a class 'well'.