Speculation OPEC will extend its deal to curb output and ease a global glut is sending oil toward its biggest weekly increase this year. While futures in New York were little changed on Friday, prices are up 4.7 percent this week after climbing back above $50 a barrel. The gain is the most since December when crude rallied after OPEC agreed on its first production cut in eight years. Kuwait Oil Minister Issam Almarzooq reiterated support for prolonging a six-month deal between the group and some non-members to trim supply past June, according to state-run news agency KUNA. The latest comments from Kuwait’s oil minister are bolstering confidence in OPEC’s commitment to drain swollen stockpiles ahead of the group’s next formal ministerial meeting on May 25 in Vienna. Five producers from the Organization of Petroleum Exporting Countries joined with non-member Oman on Sunday to voice support for an extension. […]