0.1.13
  o bug fixed: upper boundary of loop for was underestimated when bandwidth > neighbor * cellSize
  o bug fixed: the offset was wrong when dfCendroids was provided
  o improving window when looking for cells to send smoothed value
  o new argument for kernelSmoothing and smoothingToGrid: fUpdateProgress
  o neighbor argument is 0 if dfCendroids is provided
  o adding this NEWS file
  o adding unit tests
  o encoding in UTF-8 (description file)
0.1.3
  o change c++ library call for solaris compatibility 
0.1.2
  o bug fixed: manage missing values
  o bug fixed: doubles comparison
  o rename bandwith in bandwidth
  o improved documentation
  o improved memory improved (double to int when possible)
  o kernelSmoothing accept a new argument: dfCentroids
  o new smoothing mode: mobile quantile
  o log when na value is found
  o check if bandwidth > sqrt(cellSize) / 2
  o check if x and y are not null
  o encoding source files in UTF-8  
0.0.7
  o initial release of the package