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 a handle to work with the border right color.
	 * 
	 * @return a ColorHandle to deal with the border right color.
	 */
	public ColorHandle getBorderRightColor( )
	{
		return doGetColorHandle( HighlightRule.BORDER_RIGHT_COLOR_MEMBER );
	}
	/**
	 * Returns a handle to work with the border bottom color.
	 * 
	 * @return a ColorHandle to deal with the border bottom color.
	 */
	public ColorHandle getBorderBottomColor( )
	{
		return doGetColorHandle( HighlightRule.BORDER_BOTTOM_COLOR_MEMBER );
	}
	/**
	 * Returns a color handle for a given member.
	 * 
	 * @param memberName
	 *            the member name
	 * @return a ColorHandle for the given member
	 */
	private ColorHandle doGetColorHandle( String memberName )
	{
		MemberRef memberRef = new CachedMemberRef( structRef, memberName );
		return new ColorHandle( getElementHandle( ), memberRef );
	}
	/**