meta cartesian distance policy
meta periodic distance policy
add cpp test, use std inner product, order includes
fix put-in-box
change dot to use begin() and end() of array
change sum function to use std::accumulate
change product to use std functions
change meta helper name to meta_periodic_distance
add documentation for meta_image, add references for round
formatting
Merge remote-tracking branch 'origin/master' into meta_dist
Merge remote-tracking branch 'kjs_fork/meta_dist' into meta_dist
fix meta_image
change pointer to const convention
add simple periodic distance cpp test
add direct image convention test, remove confusing return statements
add more distance cpp tests
add const
Merge pull request #97 from kjs73/meta_dist

Meta dist