GitLab

Remove linphone_friend_set_presence_model() and make linphone_friend_get_presence_model() return a const pointer because the user should not be able to change his friends' presence.

Do not check equality of presence statuses because it does not work if the presence model of linphone core has been changed instead of a new one created.

Use in [sip]:
allow_out_of_subscribe_presence=1

to allow them for presence (unsecure)

Conflicts:
	NEWS
	coreapi/linphonecore.c
	java/impl/org/linphone/core/LinphoneAddressImpl.java

Use libxml2 to generate XML content.

improve documentation of macos x compilation, especially regarding generating bundle compatible with older macos version.