Fixes bug where User DataWriter wasn't being extended properly.
Phrase in options changed to user's.
Modified cache rebuilder:
Now uses the cache rebuilder for users instead of threads reducing rebuild time.
No longer extends the method rebuildDiscussionCounters, increasing speed in various actions.
Style property in message elements now set to off by default.
Optimized for faster rebuilding of the discussion cache.
Style Property to show discussion count in the user post-bit; controls for this are found in Style Properties->Message Elements
Edits phrase to 'Discussions'.