Document proper use of stash-id arg to INSERT
Documentation tweaks
Cache queries using schema:model:query-name

This is a must since it is possible to use multiple schemas by
rebinding *pgj-schema*.
Add with-db-schema and export *pgj-schema*

At the least I need this for the informal tests.
Revise tests to compile and run

But still a WIP to get the backend logging right.  pomo logging?
Revise informal tests