hmark which includes
    //     * 1 title
    //     * 1 linear regression graph and its title and information table
    //     * if kde data are available a histogram/kde graph with its control panel.
    //
    // If none of the benchmarks has kde data, the layout is the same
    // but with only one column (no hist/kde graphs).
    //
    //
    //              c1:        c2:
    //
    // r1:            *title*
    //           ___________________
    // r2:      |   summarize bar   |
    //          |_