fitgoodies-core/src/main/java/de/cologneintelligence/fitgoodies/htmlparser/FitTable.java
public FitRow insert(int index) {
        Element tr = new Element(Tag.valueOf(TAG), table.baseUri());
        FitRow row = new FitRow(this, tr);

        Element tbody = table.select("tbody").first();
        tbody.insertChildren(index + contentStartPosition, Collections.singleton(tr));
        rows.add(index, row);
        updateIndices();

        return row;
    }
public FitRow insert(int index) {
        Element tr = new Element(Tag.valueOf(TAG), table.baseUri());
        FitRow row = new FitRow(this, tr);

        Element tbody = table.select("tbody").first();
        tbody.insertChildren(index + contentStartPosition, Collections.singleton(tr));
        rows.add(index, row);
        updateIndices();

        return row;
    }
FIXME: test!