* DSL stats functions [WIP]
* refactor
* move percentile computation to bifs module; iterate
* mode and antimode
* percentile iterate
* percentile sketching
* neaten
* unit-test iterate
* unify old & new min & max functions
* unit-test cases
* code-dedupe between mode and antimode
* make mode/antimode ties deterministic via first-found-wins rule
* online help strings for new stats DSL functions
* artifacts from `make dev`
* help info on how min/max now recurse into collections
* artifacts from `make dev`
* typofix
* DSL functions for 64-bit nano-epoch timestamps
* strfntime
* nsec2gmt; move sec/nsec pairs adjacent to one another
* update on-line help
* artifacts from `make dev`
* unit-test files
* latin1_to_utf8 and utf8_to_latin1 DSL functions
* doc-build artifacts for previous commit
* Test cases for latin1_to_utf8 and utf8_to_latin1
* extend on-line help
* latin1_to_utf8 and utf8_to_latin1 verbs
* unit-test cases for verbs
* Keep with kebab-case naming convention for verbs
* webdocs
* Add natural sort order as an option for the sort verb
* Add natural sort order as an option for the sort DSL function
* doc-build artifacts for on-line help
* webdocs
* codespell fix
* unit-test files for sort verb
* unit-test files for sort DSL function
* todo
* Neaten existing DSL sketch
* rebase on #893, and sketch
* code-complete
* build artifacts for previous commit
* replace - with _ in shift and slwin