Update total number mapped object inside the Stats browser

[fredychandra]

Background

In the Stats tab browser only shows lists of contributors, numbers of cells mapped (done), assigned and how many activity progress percentage. However user still couldn't see the overall number of contributors without counted it one by one on the list. We still couldn't recognize how many total boxes compare with cells have been done. We couldn't see how many objects (buildings and roads) have been mapped during this tasking manager activated. All those information are needed for tasking manager monitoring and evaluation while doing a mapathon.

Propose Solution

1. Make a realtime/update report of total number buildings and roads have been mapped in the Stats browser
2. Provide number in the left side list of contributors and SUM in the below row, so users can easy to monitor how many people have contributed to the active task
3. Provide total numbers of boxes in the active tasking manager. So users can compare between boxes have been done with remaining boxes
4. Add Diagram of total number buildings and roads that have been mapped

@bgirardot

[Charlotte-Morgan]

This sounds like a bit of interoperability or overlap between the Tasking Manager and OSM analytics.