Improve pre error handling

ROOT/usr/lib/chem-zfs-backup-server/zfs-rsync.sh

@@ -21,6 +21,8 @@ if [ -z "$DST" ] ; then
  exit 1
 fi
 
+echo $(date): running $0 $1 $2 $3 >>$LOGFILE
+
 if [ -f $CONFDIR/${HN}_${SRC//\//.} ] ; then
  # This file can define PRE and POST as scripts which are run
  echo Including settings from $CONFDIR/${HN}_${TAG}