public void setColumnWidth(Column<T, ?> column, double width, Unit unit) {
        setColumnWidth(column, width + unit.getType());
    }
Set the width of a {@link Column}. The width will persist with the column
and takes precedence of any width set via
{@link #setColumnWidth(int, double, Unit)}.

@param column the column
@param width  the width of the column
@param unit   the {@link Unit} of measurement
stroom-core-client-widget/src/main/java/com/google/gwt/user/cellview/client/AbstractCellTable.java