WAITSCRIPT expression

   Synopsis:
      Starts an Axbasic script and waits for it to terminate

   Notes:
      Starts a new Axbasic script (run from within a new Script task). The
         current script waits until the new script has terminated, before
         resuming execution.
      Arith-Exp is the name of the new script.
               
   Examples:
      WAITSCRIPT "otherscript"
      PRINT "I'm back, baby!"
