AHMED ELJECHTIMI IN Morocco's impoverished Rif mountains, cannabis grower Mohamed El Mourabit hopes a plan to legalise the drug for some uses will raze what he calls a "wall of fear" surrounding farmers caught between poverty, traffickers and the law. The government last week approved a law to allow the cultivation, export and use of cannabis for medicine or industry. Parliament looks likely to ratify it, despite the issue dividing the governing coalition's biggest party. The change is meant to improve the lot of farmers in the often restive Rif region where it has been grown for decades, and to…