Fix vertex drawing code

Time length settings shoud have been 6 and 30 for minute and hour respectively.
NB 1 minute is 6 degrees. 1 hour is 30 degrees (6 * 5)
Make 'Weather Clock' a static header

Nice and bold
Clean code further still, all making the thing easier to read.

MAX_INTENSITY is now between 0 and 1 with the latter the MAX.
Move clock onto it's own row

So I have more space in a column next to the header info
Add functionality to select 60 minute or 12 hour forecast

* Bootsrap button group added to the UI - '60m' & '12hr'
* ProcessingJS draw() checks for selected forecast - 'minutely' or 'hourly'
* Controller checks minutely is available before making a default choice