Pivot notifications

pivot_fields: Foldr to change or add pivot fields for the main pivot table. The rsc contains all rsc properties for this resource, including pivot properties. Fold with a…
pivot_rsc_data: Fold over the resource props map to extend/remove data to be pivoted
pivot_update: Pivot just before a m_rsc_update update. Used to pivot fields before the pivot itself.
custom_pivot: Add custom pivot fields to a resource’s search index (map) Result is a list of {module, props} pairs. This will update a table “pivot_<module>”. You must…