Fix #27: incorrect definitions of 'amu' and 'dalton'
Fix #27: incorrect definitions of 'amu' and 'dalton'

Defined by (0.012 (kg/mol) / 12) / (Avogadro constant)

gentooboontoo/js-quantities,mickeyreiss/js-quantities,glassbead0/js-quantities,dubejf/js-quantities,glassbead0/js-quantities,mickeyreiss/js-quantities,mickeyreiss/js-quantities,gentooboontoo/js-quantities,dubejf/js-quantities,jhericks/js-quantities,gentooboontoo/js-quantities,jhericks/js-quantities,jhericks/js-quantities,gentooboontoo/js-quantities,mickeyreiss/js-quantities,dubejf/js-quantities,glassbead0/js-quantities,glassbead0/js-quantities,jhericks/js-quantities,dubejf/js-quantities