Two changes - database schema and URL_Root usage

The Database Schema only supports accession numbers up to 8 characters.  The DICOM standard supports up to 16.  The change in database size will be tiny, so I changed this in the database setup script. 

There were many places where your HTML did not properly use the $URL_root variable that you put into the config file.  I've added this to each of the .php pages.  A better way to do this would have your HTML header in one .php file that you include for each and every action page.  That way changes like this would only need to be made once instead of throughout the code.