Default format of OpenDocument Report
Currently reports seem to always be in 'letter'.
It would be nice if tryton (client) could utilise an option if libpaper is
installed, which provides a tool called `paperconf`. Then prior to generating
the report, the paper size could be set appropriately, for example to 'a4'.
It would probably only need to be called at client startup.
Perhaps both server and client docs could utilise it as well.