common: added units to band_energies

meta_info/nomad_meta_info/common.nomadmetainfo.json

@@ -199,7 +199,8 @@
       ],
       "superNames": [
         "section_k_band"
-      ]
+      ],
+      "units": "J"
     }, {
       "description": "Fractional coordinates of the k points (i.e. in the basis of the reciprocal lattice vectors) actually building the band",
       "dtypeStr": "f",