Add a first unit test for Dolphin, which verifies that the fix for one

Add a first unit test for Dolphin, which verifies that the fix for one
of the problems related to Dolphin's modifications to QTreeView works
as it should.

This is only a small start, but I hope that we can cover at least the
basic functionality of DolphinView, the three item views and possibly
a couple of other classes with a rather stable API soon.

svn path=/trunk/KDE/kdebase/apps/; revision=1188049