message: code review: include what you use
diff: #ifndef ALPHA_COMPLEX_ALPHA_KERNEL_D_H_
  #define ALPHA_COMPLEX_ALPHA_KERNEL_D_H_
  -#include <CGAL/Epeck_d.h> // For EXACT or SAFE version
  -#include <CGAL/Epick_d.h> // For FAST version
  #include <CGAL/version.h> // for CGAL_VERSION_NR
  #include <Eigen/src/Core/util/Macros.h> // for EIGEN_VERSION_AT_LEAST
  