NEB images Plot

For the transition state using the NEB method, one can use GVasp to plot the energy difference of all images, just run the command:

gvasp plot neb -j plot.json --save

then, one may obtain the figure.svg like this

For this task, the plot.json is like this

{
    "width": 5,
    "height": 4,
    "fontsize": 10,
}

The attention of --show, --save and --json can be seen in optimization part.