Add ranking based on test passage

[ohld]

Assign to me @ohld
Use

• Mean and std values
• Best and worse algorithms
• Failed tests

Any suggestions will be appreciated.

[aglab2]

I think that failed tests should part the biggest part of tests. Let's sort everyone by mean and give scores according to such from 10 to 0 in current test. Everyone that are at std of best competitor gets equal highest (10). If person didn't pass test, give negative (-3 for timeout, -6 for fail).