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- tables are now dimensioned by nelements instead of ntypes
- tables are only created if used
- correctly identify max size of table
- add test for illegal cutoff for tabulation
- allocated memory for tables is accounted for
- add example input using 16-bit tables

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Submitted by Steven E. Strong via github
Contributing authors: Steven E. Strong and Joel D. Eaves   Joel.Eaves@Colorado.edu

This branch implements Gaussian dynamics (GD), which is a method to do
nonequilibrium molecular dynamics simulations of steady-state flow. See
http://dx.doi.org/10.1021/acs.jpclett.6b00748. It is simple to implement
and derives rigorously from Gauss's principle of least constraint.

(cherry picked from commit 75929ee01b7c34a15e3e2ed3e8e0cbff85fe50dd)

(cherry picked from commit 433741564d166a5535bebf0e2487db6788d7871e)

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