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/src/org/eclipse/birt/report/engine/api/script/element/IGroup.java
void setKeyExpr( String expr ) throws ScriptException;
	/**
	 * Gets the name of the group.
	 * 
	 * @return the name of the group
	 */
	String getName( );
	/**
	 * Sets the group name.
	 * 
	 * @param theName
	 *            the group name to set
	 * @throws ScriptException
	 *             if the name is duplicate or the property is locked.
	 */
	void setName( String name ) throws ScriptException;
	/**
	 * Return the interval base property value of this group.
	 * 
	 * @return interval baseF property value of this group.
	 */
	String getIntervalBase( );
	/**
	 * Sets the base of the interval property of this group.IntervalBase, in
	 * conjunction with Interval and IntervalRange, determines how data is
	 * divided into groups.
	 * 
	 * @param intervalBase
	 *            interval base property value.
	 * @throws ScriptException