added checks to verify that sample_name, metagenome_name, file_name are unique
added checks to verify that sample_name, metagenome_name, file_name are unique

MG-RAST/pipeline,MG-RAST/pipeline,wgerlach/pipeline,wgerlach/pipeline,teharrison/pipeline,teharrison/pipeline,wgerlach/pipeline,MG-RAST/pipeline,teharrison/pipeline