gemhedit - Add header keyword, value and comment
     gemhead - List all headers of MEF files
       gemqa - Gemini data quality assessment
   gemseeing - Determine the image quality for imaging data
     imcoadd - Co-add direct images with removal of cosmic-ray-hits
    mgograph - MONGO like graphs
    printlog - Logfile task (hidden task)
   gimverify - Verify input/output image names (hidden task)
  gextverify - Verify extension input (hidden task)
     gsetsec - Update datasec header keyword (hidden task)
  
MEF handling:
  gemcombine - Combine MEF files
        wmef - Create MEF file from data, variance and DQ images