- Use a beginResetModel()/endResetModel() pair instead of distinct
addRows / removeRows pairs.
- Reuse the update function in the constructor().
- Let "rows" be the number of rows, not the number of rows minus one.
- Remove updateInfo() function as it does the same as update().
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>