======SpellCheckAddWord======

This adds an entry to the user's custom spell check dictionary

The data specified is:

  * Formaction - **SpellCheckAddWord**
  * Word - word to add
  * Action - **ignore** (don't mark the word as incorrect) or **exclude** (always mark the word as incorrect)

If you POST to the 'response.html' file, then the response comes back as {action:"spellcheckdelword", result: "ok" or error}