NAME:
  mkoccconfig
 PURPOSE:   (one line only)
  Build an initial config.ini for PSF reduction of occultation data
 DESCRIPTION:
 CATEGORY:
  Occultations
 CALLING SEQUENCE:
  mkoccconfig,evidx
 INPUTS:
  evidx - Set this to the RECON event index.  If this isn't a RECON
             event, set this to zero.  In this case, there must already be a
             config file that has geomid and objectid
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
  HSIZE - half-size of search region to find the star, default=10 [arcsec]
 OUTPUTS:
  for RECON events, a config.ini file is written, nor other events, a newconfig.ini
    file with information to be (manually) added to config.ini is generated
 KEYWORD OUTPUT PARAMETERS:
 CONFIGURATION:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  2021/01/27, Written by Marc W. Buie, Southwest Research Institute
  2021/03/18, MWB, added non-RECON event support
  2022/10/31, MWB, added interactive creation of initial config.ini file
                     for non-RECON events