fix the output format in aveElecStatPot.py (#4367)

* Convert the unit of the average electrostatic potential to eV and also save the results in Ry, and modify the script for calculating and plotting the average electrostatic potential to automatically plot the figure.

* fix the output format in aveElecStatPot.py

tools/average_pot/aveElecStatPot.py

@@ -64,7 +64,7 @@
 
     output.write("iz\t\t Average(Ry)\t\t z(Angstrom)\t\t Average(eV)\n")
     for iz in range(nz):
-        output.write("{:<7d}\t{:>16.9e}\t{:>16.9e}\t{:>16.9e}\n".format(iz, z_Ang[iz], average[iz], average_eV[iz]))
+        output.write("{:<7d}\t{:>16.9e}\t{:>16.9e}\t{:>16.9e}\n".format(iz, average[iz], z_Ang[iz], average_eV[iz]))
 
 
 z_values = z_Ang