Generate a k-point path for band structure plots. Usage:

    bandstructKpoints <inFile> <dk> <outfilePrefix>

<inFile> should contain a list of kpoints in the JDFTx syntax,
except with the weight replaced by a label eg. Gamma, X, L etc.
<dk> is the typical dimensionless separation (BZ~1) between k-points.

The script will generate <outfilePrefix>.kpoints containing a list
of kpoints in JDFTx input format, a gnuplot script <outfilePrefix>.plot 
and a python script <outfilePrefix>.py to plot the resulting bandstructure. 
Note that the plot scripts assume that the JDFTx run will produce 
<outfilePrefix>.eigenvals, so you may need to set the dump-name in 
the JDFTx run, move the file or edit the plot scripts.