* bin/gegl-tree-editor-action.c: (gegl_remove_item): added a function
to remove a node from the tree programatically.
* bin/editor.c: (remove_item): hooked the remove action up to remove
the parent of the currently selected item, this should remove the
selected drawable, and it's filters as well since they are the
children of the parent (the composite op).

svn path=/trunk/; revision=2715