UNIS, April 30 (Reuters) - French President Nicolas Sarkozy said on Wednesday the Israeli-Palestinian conflict must not be allowed to obstruct his planned Union for the Mediterranean, which he said would "change the world". Sarkozy aims to launch the new grouping of 27 European Union countries and their southern neighbours in Paris on July 13. He was forced to scale back plans for a full EU-style "Mediterranean Union" after fierce resistance from Germany, which feared it would split the EU and siphon off common funds. Last month, EU leaders agreed to a limited form of union involving a regular summit...