`folio-vocabulary-spellchecker-data' replaces
`folio-vocabulary-dict-list' and
`folio-vocabulary-entry-spellchecker-data' should be used to
destructure a dictionary value instead of
`folio-vocabulary-entry-dict-data'.
Add support for restoring a previously displayed section of items.
Add doc-strings.
Provide dictionary slot 1 for maintaining the currently selected word
for the various list views.
Style.
Add the `folio-vocabulary-current-word' and
`folio-vocabulary-set-current-word' defuns for maintaining an alist
pairing currently selected word to view, widget or other.
Add the `folio-sync-current-word' defcustom for synchronizing
dictionary and vocabulary views.
Tweak doc-string.
For the dictionary and vocabulary views restore any previously
displayed section and synchronize views depending on the defcustom
setting `folio-sync-current-word'.
Fix typo.