This is a modification of the categories module. It makes possible create a complete tree of categories and subcategories. Now the categories can use an image like thumbnail.
It mantains the original functions, so all the actual modules that use it, like calendar module works with this modification.
The modification is necessary for the catalague module. But can be used for a lot of modules that need a classification by categories.
This module works over Exponent 0.96.6.