fix stream row calculation

plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/IWaveform.java

@@ -79,8 +79,4 @@ public interface IWaveform extends IHierNode {
 	 */
 	public int getRowCount();
 	
-	/**
-	 * Calculate the concurrency (th enumber of parallel ongoing events) of the waveform.
-	 */
-	public void calculateConcurrency();
 }