mappings/DwC1-DwC2.specimens.csv: Added source of DwC 1.21 (http://digir.net/schema/conceptual/darwin/manis/1.21/darwin2.xsd) terms
mappings/DwC1-DwC2.specimens.csv: Added source of DwC 1.21 (http://digir.net/schema/conceptual/darwin/manis/1.21/darwin2.xsd) terms