Bug 121498 When datasource/dataset deleted, the datasource/dataset property binding element haven't been deleted
When deleted the datasource/dataset, the datasource/dataset property binding element haven't been deleted. Expected result: This operation must be a transaction.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/Module.java
import org.eclipse.birt.report.model.api.elements.structures.IncludedLibrary;
import org.eclipse.birt.report.model.api.elements.structures.PropertyBinding;
import org.eclipse.birt.report.model.api.metadata.IElementDefn;
import org.eclipse.birt.report.model.api.metadata.MetaDataConstants;
import org.eclipse.birt.report.model.api.util.StringUtil;
import org.eclipse.birt.report.model.api.validators.IValidationListener;
import org.eclipse.birt.report.model.api.validators.ValidationEvent;
import org.eclipse.birt.report.model.core.namespace.IModuleNameSpace;
import org.eclipse.birt.report.model.core.namespace.ModuleNameScopeFactory;
import org.eclipse.birt.report.model.elements.Library;
import org.eclipse.birt.report.model.elements.ReportDesign;
import org.eclipse.birt.report.model.elements.TemplateParameterDefinition;
import org.eclipse.birt.report.model.elements.Theme;
import org.eclipse.birt.report.model.elements.Translation;
import org.eclipse.birt.report.model.elements.TranslationTable;
import org.eclipse.birt.report.model.elements.interfaces.ILibraryModel;
import org.eclipse.birt.report.model.elements.interfaces.IStyledElementModel;
import org.eclipse.birt.report.model.i18n.MessageConstants;
import org.eclipse.birt.report.model.i18n.ModelMessages;
import org.eclipse.birt.report.model.i18n.ThreadResources;
import org.eclipse.birt.report.model.metadata.ElementDefn;
import org.eclipse.birt.report.model.metadata.ElementPropertyDefn;
import org.eclipse.birt.report.model.metadata.ElementRefValue;
import org.eclipse.birt.report.model.metadata.MetaDataDictionary;
import org.eclipse.birt.report.model.metadata.PropertyDefn;
import org.eclipse.birt.report.model.metadata.StructRefValue;
import org.eclipse.birt.report.model.metadata.StructureDefn;
import org.eclipse.birt.report.model.parser.DesignParserException;
import org.eclipse.birt.report.model.parser.LibraryReader;
import org.eclipse.birt.report.model.util.ModelUtil;