Add mMax caps to gridded seismicity

Consider mMax caps in spatial PDFs.
Do they make a difference?

• First update in !52 (merged)
• Need to skip faults that are omitted when model is built from nshmp-dev

added 2023 label

added ERF label and removed 2023 label

added 2023 label

mentioned in merge request !57 (merged)

closed with merge request !57 (merged)