* Add GroupedLists examples
Document grouped lists with runnable test cases over a shared
bibliography sample.
* Cover plain grouping, search, tabs by first character, both combined,
and grouping on one field while searching another
* Name the grouped field in one procedure, so the grouping changes in
one line
* Import it with import-compound, and list the examples by tag so a new
one needs no page edit
* Rewrite the opening paragraph, which described only the sidebar tabs
* Replace GroupedLists code dumps with examples
Turn the two sidebar tabs the page describes into runnable test cases,
and tighten how the examples handle an empty result.
* Give each new example its own dummy payload, and point the page at the
live tabs instead of quoting core source
* Carry the values through the filter from the start, so an All tab with
no matches yields nothing rather than the literal All
* Use the list-empty widget
* use tc-tiny-gap instead of -left -right
Mario Pietsch
68630c939d