in remesh_surf, make it so dislocations do not leave the domain via the fixed end depending on the simulation type.

[dcelisgarza]

https://github.com/dcelisgarza/EasyDD/blob/14f223773a1abacbbad95540df9b0be1bd5f4c34/dd3d_next.m#L53-L53

[dcelisgarza]

Use @dhortela's nodal lists to stop dislocations from exiting where zero displacements are applied.