Removed magic size constants from codeand instead read the initial size of certain elements as set in (S)CSS. Pass newly loaded saga text around as a jquery rather than plain text so we don't end up wrapping it multiple times.
Show list of chapters where a feature is mentioned in its popup.
* Added a lib.selCh value and onChapter event when it changes.
* Renamed lib.onSelect to onSaga for consistency.
* After loading a saga, scan through it ch= and geo-ref= and tell lib about each chapter in which a geo-ref is found.
* Re-wired the text-scroll <-> chapter drop-down to go through the new model state.
* Allow Display only 8 lines of description and then add scroll-bar.