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- Deprecate linphone_core_enable_logs(),
  linphone_core_enable_logs_with_cb() and linphone_core_disable_logs() functions.
- Introduce linphone_core_set_log_handler(), linphone_core_set_log_file() and linphone_core_set_log_level() functions.

add accessors to late and loss rate in LinphoneCallStats.

Clear missed call
Add picture for unread messages

chnage time for time change

This is making a lot of problems with video packets especially.

change date

Display missed call in recent calls tab
Notification for chat message

The rate control algorithm had a bug preventing him to enhance the quality was the network returns fine, and even worse it was setting the worse quality for the rest of the call.

This reverts commit 71f31347.

Conflicts:
	coreapi/linphonecall.c
	mediastreamer2