Add extended field support and more to userinfo filter

Now supports extended.{attribute} and remote_data.{attribute} support, e.g.

	[[*createdby:userinfo=`extended.display_name`]]
	[[*createdby:userinfo=`remote_data.likes_sheep`]]

Added all fields from modUser except cachepwd and session_stale
Removed password and sessionid

closes #571