[Star rating] Rethink calculations

[salamca]

Stars are displayed by averaging the starRating given by users. 0 for nič posebnega 1 for lepa 2 for čudovita

It seems that most users leave star rating blank if route is nothing special instead of filling out nič posebnega. This means that in time all routes will have stars, because one star with value 2, already averages to 2 and the route immediately becomes 'čudovita'

Could resolve by:

• logging 0 if no rating is given?
• displaying stars only after a certain threshold of number of votes is reached
• other options...?

[salamca]

decided: show stars only if at least 2 votes are given also show stars if number of all ascents is less than 5 from the time when starRating became possible

[salamca]

some stats that might be helpful from when starRating was added until today there were 9891 routes logged

and this many stars given: