* Touch up `!`/`!!` help
* Fix yamllint error
* Make `echo $RZ_SIZE` work using `bash`
* Move `!!ls` note to `!!??`
* Make grep-`!!` relationship more clear
* Fix test
* Add ?** as alias for ?*~...
* Zero initialize the help desc copy.
Fixes a bug when detail_cb was called but it was just garbage.
* Implement ?***
* Add tests for interactive command search
* Add string buffer output mode for internal use and use it for setting help.
* Add ?**e for interactive search of config values.
