Version 4.7.0

[Tom Keffer]

This version fixes a bunch of minor things, as well as introduces some minor new features.

Change log:

Introduced new option "generate_once". If True, templates will be generated
only on the first run of the reporting engine. Thanks to user Rich! PR #748.

Added option wee_device --current for vantage.

Fixed two typos in the Standard skin.

Fixed spelling mistakes in the Norwegian translations.  Thanks to Aslak! PR#746

Supply a sensible default context for group_deltatime when no context has been
specified.

If windGustDir is missing, extract a value from the accumulators.

Fixed typo that shows itself if no [Labels]/[[Generic]] section is supplied.
Fixes issue #752.

Fixed calculation of field "bar_reduction" for Vantage type 2 LOOP packets.

Fix problem that prevents windSpeed and windDir from being displayed in
the RSS feed. Fixes issue #755.