  COMMAND JOINSGROUP
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    Purpose: join two subgroups into one subgroup or
             join all subgroups matching a pattern into one subgroup
      Usage: JOINSGROUP(<objectID>,<subgroup1>,<subgroup2>,<newSubgroup>) or
             JOINSGROUP(<objectID>,<pattern>,<newSubgroup>)
   Examples: joinsg(1,G1,G2,G3)
             (joins "G1" and "G2" into "G3"
             joinsg(1,FRONT,test)
             (joins all subgroups like "FRONT","FRONT.1", ... into "test")
