THE 2-MINUTE RULE FOR ROCHUS-KELLER

An Assessment with Valgrind discovered that the most expensive features are mutex locking/unlocking, malloc/free of charge and QImage dealing with. So I did some optimizations concerning QImage. In commit 1f976e5b5ee3cfe40921c74b97edb8d84ff39dd3 I reorganized the Smalltalk bitmap to QImage conversion which resulted in testStandardTests working time