* go1.21: changes to support slog as part of stdlib
* Removed accidentially checked-in line of code
* Fixed minor linting issues; reenable typecheck
* go1.21: switched to stdlib slices pkg
* Moved time functions from pkg stringz to pkg timez
* Refactor options.Opt
* wip: initial work on configurable time layout
* wip: most printers now respect format.datetime and friends
* Folded pkg timefmt into timez
* Refactor options.Opt; refine options
* Add 'sq config set OPTION --help' mechanism
* Finished completion of OptDateFormatAsNumber and OptTimeFormatAsNumber
* refactor: moved cli flags to pkg cli/flag
* testh: add OptLongDB for long-running tests
* implement 'sq config dir'
* legacy dir migration: probably a bad idea
* cleanup
* Refactored SQ_CONFIG and --config
* added yaml writer
* Dialing in tests
* YAML output for 'sq driver ls'
* Significant refactoring of config
* Minor test for ioz
* Rename source.Set to source.Collection
* Cleaning up references to source.Set
* yet more linting
* yet more linting
* yet more linting
* yet more linting
* yet more linting
* yet more linting
* yet more linting
* yet more linting
* implementation work for json importers
* json driver checkpoint
* working on json.ParseObjectsInArray
* json.ParseObjectsInArray seems to be working
* checkpoint while tidying up ParseObjectsInArray
* more tidy checkpoint
* more tidy checkpoint 2
* tidying up ParseObjectsInArray
* tidy up
* code/docs cleanup
* more cleanup of json driver
* more cleanup of json driver
* flat json import seemingly working
* improvements to json driver
* json writer now prints empty [] for postgres empty tables
* Type Detector refactor
* json driver impl; refactoring of source.Files reader et al
* working on kind detector
* significant switcheroo of packages
* partway throught refactoring Kind
* major package switcheroo for Kind
