Bug 159247 Implement toString() in class StringFormatValue, NumberFormatValue and DateTimeFormatValue
Engine need the implementation of toString() method in class StringFormatValue, NumberFormatValue and DateTimeFormatValue.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/elements/structures/FormatValue.java
{
	/**
	 * Name of the config variable name member.
	 */
	public static final String CATEGORY_MEMBER = "category"; 
	/**
	 * Name of the config variable value member.
	 */
	public static final String PATTERN_MEMBER = "pattern"; 
	/**
	 * The config variable name.
	 */
	private String name = null;
	/**
	 * The config variable value.
	 */
	private String value = null;
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.core.Structure#getIntrinsicProperty(java.lang.String)
	 */
	protected Object getIntrinsicProperty( String memberName )
	{
		if ( CATEGORY_MEMBER.equals( memberName ) )
			return name;