[gmx-users] extend the order of Ryckaert-Bellemans dihedral

[dimka]

I just found this post back in 2003,
http://www.gromacs.org/pipermail/gmx-users/2003-March/004537.html

has the Ryckaert-Bellemans potentials been extended for orders higher
than 5th since then?  if not, can someone tell me what file to modify
to do this?

Dmitry.