fixed seen_files check; added pongdelay option; ammended comments
fixed seen_files check; added pongdelay option; ammended comments

mrow4a/smashbox,owncloud/smashbox,labkode/smashbox,cernbox/smashbox,switch-ch/smashbox,mrow4a/smashbox,mrow4a/smashbox,cernbox/smashbox,labkode/smashbox,nickv-oc/smashbox,labkode/smashbox,owncloud/smashbox,switch-ch/smashbox,cernbox/smashbox,nickv-oc/smashbox,cernbox/smashbox,owncloud/smashbox,nickv-oc/smashbox,switch-ch/smashbox,labkode/smashbox