NAME:
  hstloadone
 PURPOSE: 
  Read one header of a flt file and push select keywords to database
 DESCRIPTION:
  Opens the file and extracts keywords with READFITS. An appropriate INSERT
  or optionally, REPLACE command for mysql is performed. 
 CATEGORY:
  Database
 CALLING SEQUENCE:
  hstloadone,fn,exten,dblun
 INPUTS:
  fitsname   - String  which identifies the compressed
               .gz file to be processed. The value of PATH is prepended.
 OPTIONAL INPUT PARAMETERS:
 OUTPUT:
 KEYWORD INPUT PARAMETERS:
 PATH        - Path to locate fitsname, default is
               '/net/amber/raid1/buie/hst/12897/'
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  2007/03/28, Written by Peter L. Collins, Lowell Observatory
  2012/07/02, MWB, cloned for C19 data
  2014/07/01, MWB, cloned for the NH search, program 13633.
  2020/06/22, MWB, generalized version