Bug 164070 Support widows/orphans properties on text item
Support widows/orphans properties on block text item(label, text, data etc), About the definition of widows/orphans, please refer to CSS spec.
model/org.eclipse.birt.report.model.tests/test/org/eclipse/birt/report/model/api/DesignElementHandleTest.java
* <tr>
 * <td></td>
 * <td>Gets choices of the font family property of a style.</td>
 * <td>It has choices and the number of choices is 5.</td>
 * </tr>
 * <tr>
 * <td></td>
 * <td>Gets choices of the master-page property of a style.</td>
 * <td>It has no choices.</td>
 * </tr>
 * <tr>
 * <td></td>
 * <td>Gets client number of the style1.</td>
 * <td>It has 2 clients.</td>
 * </tr>
 * <tr>
 * <td></td>
 * <td>Gets the number of derived elements of the style1.</td>
 * <td>It has 0 derived elements.</td>
 * </tr>
 * <tr>
 * <td>testChoice</td>
 * <td>Gets choices of the font family property of a label.</td>
 * <td>It has choices and the number of choices is 5.</td>
 * </tr>
 * <tr>
 * <td></td>
 * <td>Gets choices of the text property of a label.</td>
 * <td>It has no choices.</td>
 * </tr>