Bug 153040 Template definition should be removed after the report item is deleted
Steps to reproduce: 1.New a report, extends lib.label 2.Convert the label to template report item, and revert it back to the report item 3.Delete the label 4.Remove the included library Expected result: Library can be removed Actual result: A BIRT exception occurred. Plug-in Provider:Eclipse.org Plug-in Name:BIRT Model Plug-in ID:org.eclipse.birt.report.model Version:2.1.0.v20060808-0630 Error Code:Error.LibraryException.LIBRARY_HAS_DESCENDENTS Error Message:The library "Lib" can no be dropped because it has descendents "NewLabel" in the current module.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/ElementPropertyDefn.java
* @param flag
	 *            <code>true</code> if the property value can be inherited,
	 *            <code>false</code> otherwise.
	 */
	void setCanInherit( boolean flag )
	{
		isInheritable = flag;
	}
	/**
	 * Sets the message ID for the group name.
	 * 
	 * @param id
	 *            The group name message ID.
	 */
	void setGroupNameKey( String id )
	{
		groupNameKey = id;
	}
	/**
	 * Checks whether the property is visible to the property sheet.
	 * 
	 * @return <code>true</code>.
	 */
	public boolean isVisible( )
	{
		return true;
	}
	/**
	 * Checks whether the property value is read-only in the property sheet.
	 *