Write main header. JJ2000 main header corresponds to the following sequence of marker segments:

       <ol>
       <li>SOC</li>
       <li>SIZ</li>
       <li>COD</li>
       <li>COC (if needed)</li>
       <li>QCD</li>
       <li>QCC (if needed)</li>
       <li>POC (if needed)</li>
       </ol>