Customising PWS Dashboard (early versions)

Now using custom tag %rainlasthourmm% to give me “rain last hour”, so I don’t get negative “rain yesterday” just after midnight.

Tag %hourrn% (and presumably tag %hourrnusa%) also works over the midnight reset. It was a “good” day to check the tags: 32.6 mm rain and still going. . .

Added max/min baro times to barometer block, too.