* size of these lists. Add a tmp fake status for IP2IP subscription.
* Change loops to fit c++ 11. Remove code from Manager class.

* approvement

* presence subscription

"item" correctly reflects that in these loops, the object in question
is not an iterator but a reference to the actual object in the
collection.

* #28212: manager: on configuration error, automatically restore last working configuration file backup

refactoring.

Now the seekbar will only be updated if the updates correspond to
its associated file.

We now preview ringtones via recordedFile API.

This will allow clients to preview ringtones

 & servers

Rationale: it represents interaction with the various clients, that
it uses D-Bus is an implementation detail.

Presence notificaton for IP2IP
DBUS methods for publishing presence
Adding phone status (ringing,on the phone,ready)

This code enable presence subscription / notification based on Asterisk hint mechanism.
The presence of a SIP account will be automatically pushed by Asterisk server.
DBus interface in CallManager (subsribePresence) is added to subscribe the presence of a buddy uri for an accountID.
Then presence notification are received in buddysip.cpp. Callback to UI must be there implemented.
Lot of commented code is still in the code. Work must be done to clean it.

checkAudio() was being called before the call was removed from the
call list.

Namely by telling the client who triggered recording whether or not
recording has started.

This allows other applications to resume audio.