remove old deprecated directory listing function, now that we are onto at least node 10
remove old deprecated directory listing function, now that we are onto at least node 10

sagemathinc/smc,tscholl2/smc,tscholl2/smc,sagemathinc/smc,sagemathinc/smc,tscholl2/smc,tscholl2/smc,tscholl2/smc,sagemathinc/smc