Hint for reworking the COMetadataAccessor

[dankwart-de]

Not sure whether extractSampleNameFromXXX scales. Did you consider using extractSampleNamesFrom with possible values, like "bamFileName", "outputFileNames" (but this the latter example would be completely vague and intersecting with "bamFileName" -- so a better value would be needed). Also the concept of input and output directory is pretty vague for the plugin, because the output directory is often also used as input directory!

Maybe "extractSampleNamesFrom": "bamFileNames", "allFiles".

Originally posted by @vinjana in #23