Bug 209128 BIRT Cross tab Model Change - Support for filter on measures
TO support filter condition on cross tab measure, Model changes are needed to support filter condition list on cross tab report item.
xtab/org.eclipse.birt.report.item.crosstab.core/src/org/eclipse/birt/report/item/crosstab/core/de/MeasureViewHandle.java
* level.
	 * 
	 * @param rowDimension
	 *            qualified name of the row dimension
	 * @param rowLevel
	 *            qualified name of the row level
	 * @param colDimension
	 *            qualified name of the column dimension
	 * @param colLevel
	 *            qualifed name of the column level
	 * @return the aggregation cell handle if found, otherwise null
	 */
	public AggregationCellHandle getAggregationCell( String rowDimension,
			String rowLevel, String colDimension, String colLevel )
	{
		int count = getAggregationCount( );
		if ( count == 0 )
			return null;
		DesignElementHandle found = null;
		for ( int i = 0; i < count; i++ )
		{
			DesignElementHandle element = getAggregationsProperty( )
					.getContent( i );
			String row = element
					.getStringProperty( IAggregationCellConstants.AGGREGATION_ON_ROW_PROP );
			String column = element
					.getStringProperty( IAggregationCellConstants.AGGREGATION_ON_COLUMN_PROP );
			if ( ( rowLevel != null && rowLevel.equals( row ) )
					|| ( rowLevel == null && row == null ) )
			{