Example simulations of polarizable systems using Drude oscillators
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Each example comes in two versions for demonstrating the use of
Nosé-Hoover or Langevin thermostats.

* `butane` -- simulation in NVT ensemble with Thole damping

* `toluene` -- simulation in NVT ensemble with Thole damping and
use of the `extra/special/per/atom` keyword

* `ethanol` -- simulation in NpT ensemble with Thole damping

* `swm4-ndp` -- 4-site rigid water model in NpT ensemble (no Thole
damping)

