movistar_u7d.py, movistar_epg.py & tv_grab_es_movistartv:

Add new /cloud.m3u or /nube.m3u & /cloud.xml or /nube.xml endpoints
to access Movistar IPTV Cloud Recordings with flussonic clients
adding a new IPTV Provider, better named Recordings or something
which ends positioned after the main list once ordered
alphabetically, as most clients seem to do.

Moved cloud recordings endpoint to /cloud/channel_id/flussonic_url
because /recording is better left for local recordings.

Cloud recordings are updated every 5 minutes and persisted in the epg
db while they remain in the cloud. Both m3u list of channels with
existing recordings and the respective xml guide are also kept
in sync.

The only problem ATM is most clients limit the catchup days to less
than 1 month, while Movistar keeps them several months at the very
least.

We'll see if authors of TiviMate & OTT cooperate.

Still missing filling the epg with older recordings not present
anymore in the existing catchup guide, which means new recordings
will be kept while those 1 week older than installation of this
version will not show up ATM.

Signed-off-by: Javier Marcet <javier@marcet.info>