Different metrics results for travelledDistance and batteryTime

[pulver22]

Printing results I noticed that the distances computed from:

• historyList (keeping track of all the cells visited by the robot - regardless how many times they have been visited - after being cleaned by those visited multiple times)
• tabuList (list of cell visited only the first time)
• distance accumulated over time
  are differents. In particular, in historyList it seems that the last visited cell before completing the exploration is not added, leading to a small difference with the results in tabuList.

Instead, the distance accumulated over time is overestimated because sometimes we perform an updated even though we are doing backtracking (possibly because we are updating the target current pose of the robot while instead the robot is supposed to not move until a "new" destination is found).

For the moment, I am calling tabuList just before filling the logs so to be sure the values reported are the correct ones. But then I have to fix this discrepancy.