Add discussion about program execution statistics in MinCutKarger

[jkomyno]

In MinCutKarger, we have the following statistics:

• the longest discovery time takes is seconds, corresponding to the graph input_random_38_200.txt;
• the longest full_contraction execution takes 9 milliseconds, corresponding to the graph input_random_40_200.txt;
• the average running time is 176 seconds;
• the average discovery_time / program_time ratio is 0,142401742 when no timeout is used;
• the maximum discovery_time / program_time ratio is 0,897164825 when no timeout is used, corresponding to the graph input_random_1_6.txt.
• the second-highest discovery_time / program_time ratio is 0.833009709 when no timeout is used, corresponding to the graph input_random_4_6.txt