Added a bug trace toolbar for showing a failure's stack trace.
Fixed automatic showing between the stacktrace and the bugtrace
Refactored names of classes and actions in order to be consitent
Merge branch 'master' of https://github.com/azachar/org.eclipse.jdt.ui
into github-master

Conflicts:
	org.eclipse.jdt.junit/src/org/eclipse/jdt/internal/junit/ui/TestRunnerViewPart.java