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Replace numeric with symbolic constants in Atom and AtomVec classes

Replace instances of NULL with nullptr

Apply alternate bugfix to KSpace style MSM that avoids grid level overflow

This reverts commit 3368eb79.

Make memory usage reporting consistent

Force style unit test template bugfix

Updates to C-Library interface progammer guide and reference

Collected small changes for the next patch release

fix bug in input script templates that would have the timestep setting overwritten by a units command