Geometric means of compute times

All non-successes are counted as max-time. Fastest non-commercial solver is
scaled to 1 in second line.


    GLPK    MINTO    SYMPH   SCIP_L   SCIP_S  SCIP_C   LP_S    CPLEX   CBC
----------------------------------------------------------------------------
   3725.2   1332.7   2824.8   391.2   307.7    215.8   3953.6   28.4  487.5
----------------------------------------------------------------------------
    12.1     4.33     9.18     1.27     1      0,70    12.85    0.09   1.58
----------------------------------------------------------------------------