object processing versions

[rknop]

object processing versions need their own base_procver_of_procver table, because they differ from what's used for sources and forced sources.

Use case: DR1 exists. There's base_procver dr1 that has objects and photometry, and procver dr1 points to base_procver dr1.

Somebody does scene modelling photometry on some subset of the objects. They want to just use the diaobjectids from DR1. This will go into base_procver dr1_smp and procver dr1_smp. But, the objects are still in base_procver dr1, not base_procver dr1_smp.

So, we need a separate table for this.

We really need to document how to upload new sets of data to make sure this is done right!

[rknop]

Or... we could declare that the ONLY place we will EVER get diaobjects from is LSST AP.

In that case, we could just have a 'object_base_procver' field in the processing_version table that tells us which object processing version to look for in general for a processing version.