Bug 213126 Add support for DataEngine-leve dataset cache
In many cases the DataEngine-leve dataset cache is useful which ensure that a dataset is executed one time during rendering one report. To support this feature a new dataset property should be added. The Birt customer can choose whether this dataset need to be cached or not by setting the property in deisgn time.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DataSetHandle.java
* 
	 * @throws SemanticException
	 * @deprecated by setDataSetRowLimit method
	 */
	public void setCachedRowCount( int count ) throws SemanticException
	{
		setDataSetRowLimit ( count );
	}
	/**
	 * Returns the value of cached row count property.
	 * 
	 * @return the row count.
	 * @deprecated by getDataSetRowLimit method
	 */
	public int getCachedRowCount( )
	{
		return getDataSetRowLimit();
	}
	/**
	 * Represents the property handle which handles the structure list of data
	 * set parameters.
	 */
	final static class DataSetParametersPropertyHandle extends PropertyHandle
	{
		/**
		 * Constructs the handle for a top-level property with the given element
		 * handle and the definition of the property.
		 * 
		 * @param element
		 *            a handle to a report element