Bug corrections in version 3.20

   *  General hints for REXX 
      Corrected         Workaround for the // limitation 
   *  Sample source code 
      Corrected         Read a textfile using CharIn() 
      Corrected         Get the parameters as seen by CMD.EXE 
      Corrected         Create a directory(-tree) 
      Corrected         Delete a directory(-tree) 
      Corrected         Get the current filesystem 
      Corrected         Work on directory trees   
  *