NAME:
  wrstrarr
 PURPOSE:   (one line only)
  Write a string array to a file
 DESCRIPTION:
 CATEGORY:
  File I/O
 CALLING SEQUENCE:
  wrstrarr,str,file
 INPUTS:
  str - String array to be written, one element per line of the file.
  file - Name of file to write.
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
  APPEND - Flag, if set causes the write to be appended to an existing file,
             otherwise a pre-existing file of the same name will be overwritten
 OUTPUTS:
 KEYWORD OUTPUT PARAMETERS:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Southwest Research Institute, 2020/12/17
  2020/12/28, MWB, added APPEND keyword