Refactor output files

README.md

Tests/ExpectedOutput/AddOneRemoveOne/Orthogroups.csv

Tests/ExpectedOutput/AddOneRemoveOne/Orthogroups.txt

...tedOutput/AddOneRemoveOne/Orthogroups_SpeciesOverlaps.csv

...tedOutput/AddOneRemoveOne/Orthogroups_UnassignedGenes.csv

Tests/ExpectedOutput/AddOneRemoveOne/Statistics_Overall.csv

Tests/ExpectedOutput/AddOneSpecies/Orthogroups.csv

Tests/ExpectedOutput/AddOneSpecies/Orthogroups.txt

...ectedOutput/AddOneSpecies/Orthogroups_SpeciesOverlaps.csv

...ectedOutput/AddOneSpecies/Orthogroups_UnassignedGenes.csv

Tests/ExpectedOutput/AddOneSpecies/Statistics_Overall.csv

Tests/ExpectedOutput/AddTwoSpecies/Orthogroups.csv

Tests/ExpectedOutput/AddTwoSpecies/Orthogroups.txt

...ectedOutput/AddTwoSpecies/Orthogroups_SpeciesOverlaps.csv

...ectedOutput/AddTwoSpecies/Orthogroups_UnassignedGenes.csv

Tests/ExpectedOutput/AddTwoSpecies/Statistics_Overall.csv

Tests/ExpectedOutput/RemoveFirstSpecies/Orthogroups.csv

Tests/ExpectedOutput/RemoveFirstSpecies/Orthogroups.txt

...Output/RemoveFirstSpecies/Orthogroups_UnassignedGenes.csv

Tests/ExpectedOutput/RemoveLastSpecies/Orthogroups.csv