Bug 168172 Add the get() and set() functions of HideDetail parameter on IGroup
Add the get() and set() functions of HideDetail parameter on IGroup, and thus enable the hidedetail shifting on the Group through eventhandler.
engine/org.eclipse.birt.report.engine.tests/test/org/eclipse/birt/report/engine/api/script/element/ElementTest.java
private static final String FONT_SIZE = "20pt";
	private static final String YY_MM_DD = "YY-MM-DD";
	private static final String WHITE = "white";
	private static final String BORDER_TOP_WIDTH = "15px";
	private static final String GRAY = "gray";
	private static final String BORDER_RIGHT_WIDTH = "14px";
	private static final String YELLOW = "yellow";
	private static final String BORDER_LEFT_WIDTH = "13px";
	private static final String GREEN = "green";
	private static final String BORDER_BOTTOM_WIDTH = "12px";
	private static final String BLUE = "blue";
	private static final String BACKGROUND_POSITION_Y = "11px";
	private static final String BACKGROUND_POSITION_X = "10px";
	private static final String IMAGE_URL = "imageUrl";
	private static final String RED = "red";
	private static final String STYLE = "Style";
	private static final String LIST = "List";
	private static final String VALUE_EXPRESSION = "valueExpression";
	private static final String URI = "URI";
	private static final String IMAGE_NAME = "imageName";
	private static final String IMAGE = "Image";
	private static final double INTERVAL_RANGE = 11.5;
	private static final String INTERVAL_BASE = "2000";
	private static final String YEAR = "year";
	private static final String TEST = "test";
	private static final String TEXT_DATA = "TextData";
	private static final String DATA_SOURCE = "DataSource";
	private static final String QUERY = "query";
	private static final String VALUE = "value";
	private static final String KEY = "key";