Bug 155436 [IDE] Project>Clean dialog should not use a question-mark icon
I20060822-1200 The clean dialog displays a question mark icon to explain what clean in this context means. Since this dialog is not a message box and does not ask a question, the icon should be an info icon, or better yet, no icon to not suggest that this could be a message box.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/CleanDialog.java
projectNames.getTable().setLayoutData(data);
    	projectNames.setCheckedElements(selection);
    	
    	projectNames.getTable().setEnabled(selectedButton.getSelection());
    	projectNames.addCheckStateListener(new ICheckStateListener() {
			public void checkStateChanged(CheckStateChangedEvent event) {
				selection = projectNames.getCheckedElements();
				updateEnablement();
			}
		});
	}
	/**
	 * Performs the actual clean operation.
	 * @param cleanAll if <code>true</true> clean all projects
	 * @param monitor The monitor that the build will report to
	 * @throws CoreException thrown if there is a problem from the
	 * core builder.
	 */
	protected void doClean(boolean cleanAll, IProgressMonitor monitor)
	        throws CoreException {
	    if (cleanAll) {
			ResourcesPlugin.getWorkspace().build(
	                IncrementalProjectBuilder.CLEAN_BUILD, monitor);
		} else {
	        try {
	            monitor.beginTask(IDEWorkbenchMessages.CleanDialog_taskName, selection.length);
	            for (int i = 0; i < selection.length; i++) {
					((IProject) selection[i]).build(
	                        IncrementalProjectBuilder.CLEAN_BUILD,
	                        new SubProgressMonitor(monitor, 1));