Fix statistic: Complete competition winners.
Improve moving average.
Moving average: ignore people with less than 5 avereages.
Fix Moving average description to generate proper Markdown.
Add statistics: Moving average.
Don't use set -e as grep may return nonzero status code when nothing …
Modify database import to correctly run pre-import statements.
Fix some statistic computation failures.
Fail build if any statistic computation fails.