Show number of remaining habits to input data for

[milan-tom]

I have enabled the show question marks for missing data option. I sometimes find myself forgetting to mark some habits for a day as done or not done. It would be useful if each day in the view showed the number of remaining habits to input data for on that day (hiding this if this is equal to 0 to avoid cluttering the view).

One potential difficulty I foresee in implementing this is that days before a habit was created may be missing data for that habit. This could be solved by only considering a habit as one of the ones left to input data for from the date of creation onwards (or from the first entry if that is before the date of creation).