NAME:
  rdoccroi
 PURPOSE:   (one line only)
  Read an occultation region of interest definition file and return a structure
 DESCRIPTION:
 CATEGORY:
  Occultations
 CALLING SEQUENCE:
  rdoccroi,roi
 INPUTS:
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
  FNCONFIG - name of configuration file to read,
                default='support_files/roi.ini' which needs to be in your
                IDL_PATH (is including in my library).
 OUTPUTS:
  roi - anonymous structure with the ROI information
 KEYWORD OUTPUT PARAMETERS:
 CONFIGURATION:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Southwest Research Institute, 2023/04/05