======MessageView4 Replacement======

Use:
  ~messageview4~
  
Parameters:
  * "headers" (optional - "y" means show full headers, otherwise show condensed headers)
  * "msgformat" (optional - specifies format of 'message' in result. "text" means UTF8 text, otherwise UTF8 HTML)
  * "markread" (optional - if 'Y' or '1', then the message is marked as read)

**~[[loadmessage]]~** must have been used prior to **~messageview4~**

This returns the message details in a JSON structure as an object with members:

  * error: (optional) any error text
  * state: "ok" / "file not open"
  * headers: array of arrays. Each element in the main array is an array of three elements - header field name, decoded UTF8 header field data, raw header field data
  * message: message body at UTF8 HTML or plain text