Review Board has had a great many database schema changes over its

lifetime, and the more we add, the harder it is to determine when a

particular change was made.
This poses a problem when trying to sort out failed evolution upgrades,

as sometimes an upgrade is attempted and rolled back with evolution

information recorded that breaks future attempts at a new upgrade. When

this happens, it takes a lot of effort to figure out what happened.
This change updates all evolutions in the codebase to have a docstring

that specifies the version in which the evolution was added. This rounds

up to the first public release (so no alphas/betas).
All upgrades are also tracked in Notion, for easy reference:
https://reviewboard.notion.site/Database-Schema-Changes-38702981914e48a3b32f2a3dc5243a5c
While here, I found a stray evolution that was never used (its contents

were incorporated into another evolution). That's been deleted.

Went through and verified the versions of each of these.