Added MapPoint specification inside OctoMapInterface::deletePoint, which
is missing previously.
Modified definition of v2DiffBest for each of corresponding
apCurrentBestPoints (center, upperright, upperleft, lowerleft, and
lowerright), since it is dependent on the nSourceLevel.
Update OctomapInterface.cc
Merge pull request #43 from gsutanto/master

Modified OctomapInterface::deletePoint and KeyFrame::AddKeyMapPoint