STORY OF THE DAY: When Jason Kidd demoted Lawrence Frank from the assistant coach position, it was assumed that there was a rift between them. While that’s all but true, it appears there was tension between the two the moment Frank agreed to join the team. Tim Bontemps and Fred Kerber of New York Post detailed what went wrong from the jump: One league source told The Post the Kidd-Lawrence union began on rocky footing. After Kidd’s very public courtship of Frank,