Bug 151361 default value for reousrce folder user preference
When user does not sepecify the resourec foler user preference, can we make the current project folder (in IDE) or the current report design file's folder (in RCP) as the default value for the resource folder. This way, by default the current project folder is the resource folder where user can create their libs and images. Also please set the default user preference to be null when BIRT is freshly installed.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/util/UIUtil.java
if ( currentEditPart == null
					|| currentEditPart != null
					&& part != currentEditPart )
			{
				return null;
			}
		}
		return part;
	}
	/**
	 * Tests if the specified element is on the given tree viewer
	 * 
	 * @param treeViewer
	 *            the tree viewer
	 * @param element
	 *            the element
	 * 
	 * @return true if the element is on the tree, or false else.
	 */
	public static boolean containElement( AbstractTreeViewer treeViewer,
			Object element )
	{
		ITreeContentProvider provider = (ITreeContentProvider) treeViewer.getContentProvider( );
		Object input = treeViewer.getInput( );
		if ( input instanceof Object[] )
		{
			Object[] inputs = (Object[]) input;
			for ( int i = 0; i < inputs.length; i++ )
			{