Is there a reference that lists all available layoutPanel attributes for the module tag? I haven't much luck Googling this.
There are predefined layout panels for the Search view template as described here:
http://www.splunk.com/base/Documentation/latest/Developer/AdvancedSearch
Specifically, there are three categories of layouts:
In Splunk 6, the manuals have been refactored, and you can find this info at
http://docs.splunk.com/Documentation/Splunk/latest/AdvancedDev/AdvancedSearch
and the following pages
