Writing a fix to apply a bond-boost potential

This is a list of the changes that are made to the source code:

• The new files that are created are fix_addboost.cpp and fix_addboost.h.
• The existing files that have been modified at fix_addforce.cpp, fix_addforce.h, and fix_orient_fcc.cpp.
• The methods that have been modified are constructor, destructor, init(), and post_force().
• The new method that is added is init_list().
• The input parameters are jgroup, potentialType, atomID, param1, param2, param3, and cutoff.
• The other quantities that are introduced can be seen in a full list in Figure 10.19 in the header file.
• The LAMMPS syntax is fix FIX_NAME GROUP addboost GROUP2 ATOMID POTENTIAL P1 P2 P3 CUTOFF (we will reviews this syntax in this section).

In this section, we will create a fix that applies a boost potential and boost force to the atom located farthest from a surface along the z direction, while ensuring that the neighboring atoms that interact...