Use a preinitializer to load the settings from application.yml so
that they are available as early as possible. All settings can also
be overridden using environment variables.
The ad-hoc settins in environment.rb are then moved to this new
system so we have one consistent location for settings.
dates and times on the web site.
Also try and improve formatting of message pages a but, and include the
image of the recipient when viewing a sent message.
* @title was never set on trace editing, and thus <h2></h2> was produced
* Changed split 'trace.view.viewing_trace' into 'trace.view.title' and 'trace.view.heading'
* Introduced corresponding 'trace.edit.title' and 'trace.edit.heading'
