v0.3.1

What's Changed

• Paper figure by @NikoOinonen in #248
• Correct sign of densities and potentials in KPFM by @mondracek in #251
• Add labels to color bars by @mondracek in #254
• Add the FFPB_KPFM example by @mondracek in #255
• Adding the FePc_Au-IETS example by @ondrejkrejci in #262

Full Changelog: v0.3.0...v0.3.1