Insert a blank table row separator gap spanning "COLSPAN" columns.
The following parameters are recognized:
The number of columns (COLSPAN) to span in the table row.
Optional line height of the separator gap: (defaults to: "6px" if omitted).
Optional separator background color: (defaults to color: "@darkgray()" if omitted).
Optional centered text label: (defaults to: "space" if omitted).
This macro is defined as:
<tr>
<td@htmlAttr("colspan","@param(0)")
@htmlAttr("style","text-align: center; line-height: @fnb("@param(1)","6px"); background-color: @fnb("@param(2)","@darkgray()");")>
@ifEqual("@param(3)",""," ","@param(3)")
</td>
</tr>