public void setColumnWidth(Column<T, ?> column, String width) {
        columnWidths.put(column, width);
        updateColumnWidthImpl(column, width);
    }
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, String)}.

@param column the column
@param width  the width of the column
stroom-core-client-widget/src/main/java/com/google/gwt/user/cellview/client/AbstractCellTable.java