to add new flags (pass a flag in the constructor, rather than specific
booleans. This in order to fix:
11249: Add flag to write only the body in html output.
a mime type and a flag argument. Also fix the following bugs:
9746: get rid of bogus empty <style> in head.
8143: save wrap column in editor shell in case it's set before the
editor is created.
9470, 9488: allow explicit specification of formatted output.
This checkin adds the implementations for encoding
HTML and plain text:
nsTextEncoder::EncodeToString(..)
nsHTMLEncoder::EncodeToStream(..)
Hooked these services into the nsHTMLEditor implemenation
We probably want to update the clipboard code to
use the same pattern as in nsHTMLEditor.cpp
