PARIS (Reuters) - France is considering whether to host a meeting of the  International Lebanon Support Group to discuss the political crisis in the country, a French presidential source said on Saturday.  The source said there was no decision yet on whether it would take place or whether it would be a ministerial meeting.  The group includes Britain, China, France, Russia and the United States - the five permanent members of the United Nations Security Council.    (This story has been refiled to remove reference to Germany in third paragraph.) 