In recent version of ITK, template parameters for PointsLocator have changed

Since 2ea5b37391ca21f2c1e295e803da2740d6ea6980 PointsLocator templater
parameters have been simplified
fix issue #26
remove using namespace H% when not needed in StatisticalModel.txx
Made template parameters of itkPointsLocator depend on ITK version
Merge branch 'master' of git://github.com/statismo/statismo into vtk6-compatibility