By Robert Harvey LONDON (Reuters) -Oil prices rose by more than $2 on Tuesday on tensions in the Middle East and reduced Libyan output, but were yet to fully recovered from steep losses earlier this week. Brent crude futures rose by $2, or 2.63%, to $78.12 a barrel at 1312 GMT, while U.S. West Texas Intermediate crude futures gained $2.09, or 2.95%, to $72.86 a barrel. Tensions in the Middle East and an ongoing supply outage in Libya offered support to prices on Tuesday, analysts said. Some major shipping firms are still avoiding the Red Sea due to attacks by Yemeni Houthi militants, which hav…