PR to master: Making multi seed point lattices feature

Now, we will merge this feature from the periodic relaxation branch into master. Commits: 8e089bdf 2f774356 395b87ca 90d26216 8a8ca458 6d7386e4 cc3492d3 76b32652 8896b41a 67dea671 682811ac 04d1fda3 4a209918

• Open tasks

• Combine commits in branch

• Rebase/merge on top of OpenKIM branch once merged into master

• Testing: create mesh that tests feature

  • Fix existing tests
  • Add test for new type of mesh generation