* 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
* initial refactoring for the numRows param
* work on driver.NewBatchInsert
* work on NewBatchInsert
* batch insert seems to work
* switched testh.Insert to use BatchInsert
* doc cleanup
* batch insert for dbwriter and csv
* removed unneeded NumRows from driver.StmtExecer
* minor tidyup