remove non-ASCII characters from doc source files

[References:]

Brown, W.M., Carrillo, J.-M.Y., Mishra, B., Gavhane, N., Thakker, F.M., De Kraker, A.R., Yamada, M., Ang, J.A., Plimpton, S.J., “Optimizing Classical Molecular Dynamics in LAMMPS,” in Intel Xeon Phi Processor High Performance Programming: Knights Landing Edition, J. Jeffers, J. Reinders, A. Sodani, Eds. Morgan Kaufmann. :ulb,l

Brown, W.M., Carrillo, J.-M.Y., Mishra, B., Gavhane, N., Thakker, F.M., De Kraker, A.R., Yamada, M., Ang, J.A., Plimpton, S.J., "Optimizing Classical Molecular Dynamics in LAMMPS," in Intel Xeon Phi Processor High Performance Programming: Knights Landing Edition, J. Jeffers, J. Reinders, A. Sodani, Eds. Morgan Kaufmann. :ulb,l

Brown, W. M., Semin, A., Hebenstreit, M., Khvostov, S., Raman, K., Plimpton, S.J. Increasing Molecular Dynamics Simulation Rates with an 8-Fold Increase in Electrical Power Efficiency. 2016 International Conference for High Performance Computing. In press. :l

[(KC05)] A. N. Kolmogorov, V. H. Crespi, Phys. Rev. B 71, 235415 (2005)

:link(vanWijk)

[(vanWijk)] M. M. van Wijk, A. Schuring, M. I. Katsnelson, and A. Fasolino, 

[(vanWijk)] M. M. van Wijk, A. Schuring, M. I. Katsnelson, and A. Fasolino,

Physical Review Letters, 113, 135504 (2014)

"bond_style oxdna/fene"_bond_oxdna.html). The coefficients

in the above example have to be kept fixed and cannot be changed without reparametrizing the entire model.

Example input and data files can be found in examples/USER/cgdna/examples/duplex1/ and /duplex2/.

Example input and data files can be found in examples/USER/cgdna/examples/duplex1/ and /duplex2/.

A simple python setup tool which creates single straight or helical DNA strands, 

DNA duplexes or arrays of DNA duplexes can be found in examples/USER/cgdna/util/.

A technical report with more information on the model, the structure of the input file,