Bug 132786 Value2 should be cleaned after convert operator from between to equal in highlight rule.
Description: Value2 should be cleaned after convert operator from between to equal in highlight rule. Steps to reproduce: 1. Insert a data. 2. Set highlight rule in Property Editor. 2 between 1 and 3, color blue. 3. Save the report 4. Modify highlight rule, change to 1 equal 1, color blue. 5. Save the report, see generated xml source. Expected result: In xml source, value2 should be cleaned in highlight expression. Actual result: In xml source, value1 is 1 and value2 is 3.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/HighlightRuleHandle.java
* Returns the style of the border bottom line. The return value is one of
	 * the CSS (pre-defined) values see <code>DesignChoiceConstants</code>.
	 * They are:
	 * <ul>
	 * <li><code>LINE_STYLE_NONE</code>
	 * <li><code>LINE_STYLE_SOLID</code>
	 * <li><code>LINE_STYLE_DOTTED</code>
	 * <li><code>LINE_STYLE_DASHED</code>
	 * <li><code>LINE_STYLE_DOUBLE</code>
	 * <li><code>LINE_STYLE_GROOVE</code>
	 * <li><code>LINE_STYLE_RIDGE</code>
	 * <li><code>LINE_STYLE_INSET</code>
	 * <li><code>LINE_STYLE_OUTSET</code>
	 * </ul>
	 * 
	 * @return the border bottom style
	 */
	public String getBorderBottomStyle( )
	{
		return getStringProperty( HighlightRule.BORDER_BOTTOM_STYLE_MEMBER );
	}
	/**
	 * Sets the style of the border bottom line. The input value is one of the
	 * CSS (pre-defined) values see <code>DesignChoiceConstants</code>.
	 * 
	 * @param value
	 *            the new border bottom line style
	 * @throws SemanticException
	 *             if the value is not one of above.
	 * @see #getBorderBottomStyle( )