This PR ensures that duplicates are dropped across numerous files, addressing issues #455, and #456.

Files include:

• beataml_samples.csv
• ctrpv2_experiments.tsv.gz
• gcsi_experiments.tsv.gz
• liver_copy_number.csv.gz
• novartis_transcriptomics.csv.gz
• ccle_drugs.tsv.gz
• ctrpv2_mutations.csv.gz
• gcsi_mutations.csv.gz
• liver_transcriptomics.csv.gz
• pancreatic_mutations.csv.gz
• colorectal_transcriptomics.csv.gz
• fimm_drugs.tsv.gz
• gdscv1_drugs.tsv.gz
• nci60_drugs.tsv.gz
• prism_drugs.tsv.gz
• ctrpv2_drugs.tsv.gz
• gcsi_drugs.tsv.gz
• gdscv2_drugs.tsv.gz
• novartis_mutations.csv.gz