Fix warning about unused variable.

Change-Id: I557785911073a35100902aa631fcef81133615cc
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
Remove deprecated algorithms usage from itemviews

QtAlgorithms is getting deprecated,
see http://www.mail-archive.com/development@qt-project.org/msg01603.html

Change-Id: I68efdd1b08b94a737345644a5b588ffff5caac63
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>
Reviewed-by: Thorbjørn Lund Martsum <tmartsum@gmail.com>
qdoc: Removed declared but undefined member function

The declaration for addToQmlModule() in class Tree
is removed.

Task-number: QTBUG-33350
Change-Id: I2278a67cd6daf0e7723b4bf6d33ff9ed33cf9266
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>