(issue68) License corrections: * the overall package is GNU GPL v==3. * Qt has to be used as GNU GPL, so mention it. * Oxygen is GNU LGPL v>=3. * minor corrections like typos, better phrasing for freedom protection, use GNU consistently.

.figure img {
    border: 1px solid lightgrey;
    margin-bottom: 10px;
    padding: 4px;
}
.figure .caption {
    margin-top: 0px;
    margin-bottom: 20px;
}