Instance counting

sflphone-gtk/src/Makefile.am

sflphone-gtk/src/actions.c

sflphone-gtk/src/dbus.c

sflphone-gtk/src/dbus.h

src/dbus/Makefile.am

src/dbus/callmanager.cpp

src/dbus/callmanager.h

src/dbus/configurationmanager.cpp

src/dbus/configurationmanager.h

src/dbus/dbusmanager.h

src/dbus/dbusmanagerimpl.cpp

src/dbus/dbusmanagerimpl.h

src/dbus/instance-glue.h

src/dbus/instance-introspec.xml

src/dbus/instance.cpp

src/dbus/instance.h

src/dbus/org.sflphone.SFLphone.service.in