Added mubohr to unit registry.

common/python/nomadcore/unit_conversion/unit_conversion.py

@@ -21,6 +21,7 @@ logging.getLogger("pint").setLevel(logging.ERROR)
 ureg = UnitRegistry()
 ureg.define('forceAu = hartree / bohr')
 ureg.define('inversecm = 1.9864475e-23 * joule')
+ureg.define('mubohr = 9.274009994e-24 J / T')
 
 
 @cachetools.cached(cache={})