Use generated constant field names in criteria queries

[jamoore]

All model objects have public final static constants with their field names. Though these have to be parsed with LsidUtils doing this statically wouldn't effect performance. E.g.

import ome.tools.lsid.LsidUtils;

public class Example extends Query
{

    private static String pix_field = LsidUtils.parseField(Image.DEFAULTPIXELS);

    protected void buildQuery(Session session) 
    throws HibernateException, SQLException
    {
        Criteria c = session.createCriteria(Image.class);
        Criteria pix = c.createCriteria(pix_field,LEFT_JOIN);
...