**Why?** Make it possible for novice users to find data and explore connections
between assets/logs without needing to totally grok the farmOS data model first.
i.e.
* Navigate from a plant asset to a list of all the seed/plant assets with the same crop/variety
* Navigate from a plant asset to a list of all the seed/plant assets from the same season
* Navigate from a log in the compost category to a list of all the logs in the compost category
* Navigate from a material asset to a list of all the materials with the same material type