Boomer markdown output

- Boomer markdown output should not entirely obfuscate the IDs (labels with ID in brackets maybe?)
- Combined posterior probability for each clique
- Some confidence measure (multiplication of the probabilities with least next likely probability)
- Some way to go quickly to the images from the markdown output

The issue names no files, tests, or entry points. First locate the Boomer markdown-output implementation and inspect how IDs, clique probabilities, confidence, and image links are represented. Done means the requested output details are defined, implemented, and covered by appropriate examples or tests.

Written by the indexing model from the issue text.