By Mark Trevelyan (Reuters) – Russian opposition politician Alexei Navalny cracked jokes on Wednesday in his first court appearance since being transferred to an Arctic penal colony, but a judge rejected his latest challenge against his treatment in prison. Navalny appeared by video link from the “Polar Wolf” colony to which he was transferred last month from a prison in Melekhovo, east of Moscow, in an arduous three-week journey by road and rail. He drew laughter from the judge when he asked on the call whether the Melekhovo colony had thrown a party to celebrate his departure, and whether it…