* [DH_AGENT_PROPERTY,NEW] Rewrite of agent properties,
  allowing enumeration of properties per agent and agents+properties.
  The rewrite makes it possible to collect properties of agents
  in simple iterative structures, allowing easy appropriation in
  the upcoming Web UI, where the use case select properties.
* [DH_AGENT,NEW] Partial rewrite of the HTML overview of all agents
  based on the rewritten agent properties implementation.