DrTest could display the second pane as a tree

[jecisc]

I often have hierarchy of tests in my test packages but in DrTest second pane we only have a list of classes sorted alphabetically.

It would be great to display it as a tree instead so that we can see the hierarchy and know better how to select our tests to run.

Today with christophe we ran tests selecting one class but it was abstract and in the end 0 test ran. And we had to go in calypso to see which classes were its subclasses to select them also

[Ducasse]

Yes!

[jecisc]

Done by @AlexisCnockaert !