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.lib.explorer/src/org/eclipse/birt/report/designer/ui/lib/explorer/LibraryExplorerTreeViewPage.java
{
				return Messages
						.getString( "LibraryExplorerTreeViewPage.toolTips.DragAndDropLayout" ); 
			}
			else if ( object instanceof ParameterHandle
					|| object instanceof ParameterGroupHandle
					|| object instanceof EmbeddedImageHandle
					|| object instanceof ReportItemHandle )
			{
				return Messages
						.getString( "LibraryExplorerTreeViewPage.toolTips.DragAndDropToOutlineORLayout" );
			}
			if ( object instanceof LibraryHandle )
			{
				return ( (LibraryHandle) object ).getFileName( );
			}
		}
		return ""; 
	}
	/**
	 * The <code>Page</code> implementation of this <code>IPage</code>
	 * method disposes of this page's control (if it has one and it has not
	 * already been disposed). Disposes the visitor of the element
	 */
	public void dispose( )
	{
		if ( reportPreferenceNode != null )
			reportPreferenceNode.removePreferenceChangeListener( this );
		super.dispose( );
	}