Make CapCollection understandable and useable by humans

* Make the declaration of fct and it in the constructor Collection,
 instead of adding them from the outside
* Add a function to flatten a list containing collection (solves the
 radioob search crash)
* Better display of collections in the "ls" command (and display both id
 and title)
* The "cd" command goes to the root of the path (like the UNIX cd)
* Move the Video object of canalplus in a correct path
* Make Collection iterable
* Add comments to CapCollection
* Cache the result of fct in a Collection; it is only called once
* CollectionNotFound errors can be more explicit by providing a path
* Require utf-8 in collection paths
* Code cleanups

modules/canalplus/pages/video.py

@@ -1,31 +0,0 @@
-# -*- coding: utf-8 -*-
-
-# Copyright(C) 2010-2011 Nicolas Duhamel
-#
-# This file is part of weboob.
-#
-# weboob is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# weboob is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU Affero General Public License for more details.
-#
-# You should have received a copy of the GNU Affero General Public License
-# along with weboob. If not, see <http://www.gnu.org/licenses/>.
-
-
-from weboob.capabilities.video import BaseVideo
-
-
-__all__ = ['CanalplusVideo']
-
-
-class CanalplusVideo(BaseVideo):
-    swf_player = False
-    @classmethod
-    def id2url(cls, _id):
-        return 'http://service.canal-plus.com/video/rest/getVideosLiees/cplus/%s' % _id