The regexp key is optional.
Add preliminary support for BiDi formatting.
Add support for cyclic state variables.
Copy region or word to other buffer window.
Add predicates for lower and upper case character at point.
Indent.
Add customization group.
Add let-bound `folio-spellcheck-current-language' and
`folio-spellcheck-current-syntax-table' state variables.  Fix compile
error.  Add `folio-spellcheck-unset-buffer' for convenience.
Add support for Aquamacs' NSSpellChecker.
Initial commit.