New filtering option: "path"

everywhere there is a filter definiton (ie: actions, event-handlers, filter operation) it should be possible to give a path value for the filter:

Path: /default-domain/sections

means :

• action: the current document path startswith /default-domain/sections
• event-handlers: the path of the document attached to the event starts with ...
• filter operation: document is filtered out if its path doesn't startwith ....