Bug#645975: alacarte can't neither disable nor add menu entries

[Fabian Greffrath]

> Traceback (most recent call last):
>   File "/usr/share/alacarte/Alacarte/MainWindow.py", line 432, in on_item_tree_show_toggled
>     self.editor.setVisible(item, False)
>   File "/usr/share/alacarte/Alacarte/MenuEditor.py", line 200, in setVisible
>     menu_xml = self.__getXmlMenu(self.__getPath(item), dom, dom)
>   File "/usr/share/alacarte/Alacarte/MenuEditor.py", line 473, in __getXmlMenu
>     node = self.__addXmlMenuElement(element, name, dom)
>   File "/usr/share/alacarte/Alacarte/MenuEditor.py", line 484, in __addXmlMenuElement
>     return element.appendChild(node)
>   File "/usr/lib/python2.7/xml/dom/minidom.py", line 1550, in appendChild
>     "two document elements disallowed")
> xml.dom.HierarchyRequestErr: two document elements disallowed

The cause for both these bugs seems to be python 2.7. If I change 
/usr/bin/alacarte's shebang line to "#! /usr/bin/python2.6 -OOt" it 
works again as expected.

  - Fabian