btsync_overbyrn.plg - detect remote version of btsync, needed for successful in-plugin update to function. gui now shows remote version instead of "unknown".  Minor change to tar during application upgrade to ensure extract to correct temp location. change logic used to determine if bysync installed from whether installdir exists to whether btsync binary exists. Fixes courtesy of ikosa from unRAID forum. Thanks ikosa!

Version bump to 1.6