#246 title tooltips in daily activity

[Alexander Schuch]

As shown in the attached screenshot, the tooltip for
each of the images that make up the daily activity
bar shows the same number as the one that is printed
right above the bar - the number of lines for that
day.

But instead, each image should have the number of
corresponding lines for the given part of the day
(night, morning, afternoon, evening) as (title)
tooltip (same goes for the alt-text). Those numbers
are known by the script already, as they have to be
used to calculate the height of the images. All that
is missing is that they are put in the title and alt
attributes instead of the total number of lines per
day.