Documentation:
- finish documentation
- limits (cycles)
- more examples

Testsuite:
- finish (`back ways)
- popup first and last

Sequencer NG:
- implement advanced features (dialogs and buttons handling)
- map helps	$[ alias: "help", ... ]
- map captions	$[ alias: "caption", ... ]
- map buttons	$[ alias: "buttons", ... ]
-		`default: "buttons"

Questions:
- voluntary cycles detection (printconf)?
- allow terms in the sequence?
