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}