Add possibility to move application to another category

[Christian Baumhof]

Binary package hint: gnome-main-menu

Please add the possibility to move an application from one category to another in an easy way.

For example, I have only one package in the Graphics section, namely OOo Draw, so I'd like to move it to the Office section. To do that, I have to delete it in the graphics section and add a new entry in the office section, where I have to set up an identical copy. Please add a button to enable a direct move or allow drag and drop between categories.