Lineage system

[osarrouy]

We should re-introduce the lineage system that we designed in the previous versions of pando with a new rationale: a commit or PR should NOT automatically open a new Lineage Request [because it will clutter everything] but people should be able to easily open a Lineage Request pointing to commit, or a PR, or an issue, etc. To achieve this we would just need to:

• Turn the Repository into a TokenManager.
• Turn the Colony or renamed Pando app into a TokenManager and update it to handle multiplying factors in authorship depending on which repository the requests come from.
• Update and publish the WeightVoting app we had developed for the first version of pando.