Bug 10403 Project creation should confirm the bin directory can be scrubbed
When a user creates a new project for an existing directory structure, we should confirm that the output directory can be deleted then rebuilt. Some users are creating projects & pointing the output folder at a bin directory which contains more than just .class files which can be rebuilt from the available .java files.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/BuildPathsBlock.java
private IWorkspaceRoot fWorkspaceRoot;
	private CheckedListDialogField fClassPathList;
	private StringButtonDialogField fBuildPathDialogField;
	
	private StatusInfo fClassPathStatus;
	private StatusInfo fBuildPathStatus;
	private IJavaProject fCurrJProject;
		
	private IPath fOutputLocationPath;
	
	private IStatusChangeListener fContext;
	private Control fSWTWidget;	
	
	private boolean fShowSourceFolderPage;
	
	private SourceContainerWorkbookPage fSourceContainerPage;
	private ProjectsWorkbookPage fProjectsPage;
	private LibrariesWorkbookPage fLibrariesPage;
	
	private BuildPathBasePage fCurrPage;
		
	public BuildPathsBlock(IWorkspaceRoot root, IStatusChangeListener context, boolean showSourceFolders) {
		fWorkspaceRoot= root;
		fContext= context;
		
		fShowSourceFolderPage= showSourceFolders;
		
		
		fSourceContainerPage= null;
		fLibrariesPage= null;