[T.3.2] Collect Library of Standard Analyses for ReBenchDB

[smarr]

The community has a number of analyses that "everyone" uses. Providing them as reusable building blocks would make the day-to-day data analysis much easier.

Each analysis should come with documentation, including short overview notes and guidelines on when they are applicable, and which (statistical) assumptions need to be made/properties need to hold to correctly use them.

For a start, as for the rest of ReBenchDB, they'll be in R, but most people in the community use Python, so, we should consider how to make that available, too.