Sorting and searching of parameter list

[GoogleCodeExporter]

Blender's built-in searching and alphabetical sorting of CollectionProperty 
lists within the UI does not seem to work for the General Parameters list.

To test this, add several parameters and name them "c", "a", and "b" in that 
order. Next, hit the "+" sign at the bottom of the list, which will reveal the 
search and sort options. Type any of the parameter names (e.g. "c") just 
defined in the search field and hit Enter. Instead of showing the filtered 
parameter name, the list now shows nothing. Clear the search field and hit 
enter to bring all the parameter names back. Now try hitting the AZ button, 
which is supposed to sort the list. Instead, it stays in the same exact order.

Original issue reported on code.google.com by [email protected] on 14 Apr 2014 at 9:43