Support for same DUnit TTestCase in multiple TTestSuite

[Jeroen Wiert Pluimers]

One of the DUnit features is that you can nest TTestCase instances inside TTestSuite levels.

This opens up the possibility to have different SetUp/TearDown combinations surrounding the same tests.

Currently, when using "run selected tests", TestInsight will only run the selected tests inside the first suite it finds in the suite tree.

Furthermore, the TestInsight UI does not show the suite path.

This makes it hard to verify differences of the same test, within the various branches of the suite tree.

[Stefan Glienke]

Implemented in 1.2 via the same GUI as known from the DUnit GUI.