After all these years, it’s still hard to believe that the Philadelphia Flyers were the team Wayne Gretzky victimized en route to yet another potentially-unbreakable NHL single-season record. I could see it against Calgary with the Battle of Alberta, and even against the lowly Canucks or Devils. But no, it had to be against the Orange and Black in a down year. But it happened, December 30, 1981. Needing five goals to reach 50 in just his 39th game, Number 99 decided to get them all in one night — and do it against one of the tougher teams in …