- refactoring, moved to subdir valid/

resources/test/valid/alto/00000001.xml

resources/test/valid/docbook/DocBookSample.xml

resources/test/valid/gml/CompositeCurve.xml

resources/test/valid/kml/KML_Samples.kml

resources/test/valid/mei/mei2015_testing.mei

...es/test/valid/mets/RiesTaunA_1666408611-19330529_mets.xml

...es/test/valid/mods/RiesTaunA_1666408611-19330529_mods.xml

resources/test/valid/slubrights/rights.xml