remove default pbc use in cell lists
replicate some tests for cartesian cell lists, fix box size for test
add cartesian energy test, add corresponding inverse power
replicate hswca test
replicate lattice spacing tests
replicate applicable part of test
replicate more tests, hswca, 2d, frozen
add hswca cell lists frozen, replicate cpp tests
add more tests, something is not OK
change boxvec to agree with coords, still frozen-celllist interaction seems broken
fix test
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update hs wca wrapping
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Merge pull request #84 from kjs73/cell_dist

Cell lists distance policy, application to potentials
add documentation, add layout
add wrapping
fix typo