Added: install pg
Changed file locations of various dev functionality.
Started: Updating ArangoDB to Topogo (PG abstraction layer)
Added: Job .concat
Fixed: when last reply does not exist. Added: custome .reply group/id
Fixed: various bugs with migrations and Topogo.
Fixed: new finish function was not being called.
Added: Screen_Name .create to use new Topogo lib.
Fixed: doc_to_equals generating wrong strings.
Updated: Screen_Name .update to use Topogo.
Updated: Screen_Name .trash now uses Topogo.
Updated: Screen_Name .untrash now uses Topogo.
Fixed: River job concat. Update: Screen_Name .delete_trashed.
Changed: fewer connect/end ops
Improved: re-use of PG connections on a per-River basis
Fixed: connections to PG now close when no longer needed.
Refactored: pg no longer used, in favor of any-db pools.
Added: automatic .rows for T.run
Removed: obsolete .del_list
Fixed: .to_upper_case checks for empty-ness.