Break out JvmCommand so we can have other types. [refs #63931792]
Make a WithAppendableClasspath trait -- cleanup
Clean up runner Main.scala even more
Add PostgreSQL server finders. [finishes #63931642]
Commit a decent postgresql.conf for dev. [resolves #63931948]
Run postgres locally.

[resolves #63932356]
[resolves #63931792]
[resolves #63932196]
Ignore database/ directory
Change logging so Postgres gives no errors
Make Build.scala more legible
Add db-evolution-applier. [resolves #64343996]