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
  *

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