Add classes for calibrating average ensemble and ensemble of tragedies - #1048

  1 files  ±0    1 suites  ±0   6m 7s ⏱️ +3s
758 tests ±0  757 ✅ ±0  1 💤 ±0  0 ❌ ±0 
769 runs  ±0  768 ✅ ±0  1 💤 ±0  0 ❌ ±0 

Results for commit e3da3ec. ± Comparison against earlier commit 51630a6.