HTML editor

All,

I just committed my changes to integrate the TinyMCE editor into RoundCube for HTML editing. The Subversion revision is 345. Everything should be pretty seamless, but please note the following:

* To enable use of the editor for composing HTML messages, check the
  "Use HTML Editor" box in the Settings page
* When replying/forwarding a plain text message, the plain text
  editor is always used by default. You can toggle on the HTML
  editor using the radio buttons below the text area
* Spellchecking doesn't work within the HTML editor - I'm
  contemplating various solutions (anyone?)
* There's a new column in the "identities" database table to store
  whether the signature is HTML or not. I modified the "initial" and
  "update" scripts in the SQL directory, but let me know if there
  are problems...
* When sending an HTML message, a plain text version is also
  included in the outgoing MIME message.
* Displaying picture attachments within the editor doesn't work - I
  think a custom TinyMCE plugin would be needed to bridge between
  the two.

Enjoy! :-)