Gillingham will be cheering on Mansfield Town from afar tonight before their game against them on Saturday. It’s one of several key fixtures in League 2 which will have a bearing on Gillingham’s own play-off hopes. Those hopes are hanging by a thread, but a win over Barrow on Saturday and a defeat for rivals Crawley has left the door slightly ajar. Stephen Clemence’s men need to win their last two games to stand any chance of making it and they head to third-placed Mansfield on Saturday. The Stags – managed by experienced coach Nigel Clough, who has just been named League 2 manager-of-the-seas…