Ref T4427.

• When points are configured, show them on the task detail page (just a simple property, at least for now).
• Typecast points better to avoid "joe changed points from 12 to 12." beacuse we compare the stored value (as a string) to the new value (as a double).

• Saw points on detail view.
• Created task with points, then edited it without touching points. No more spurious "changed from 12 to 12" transaction.