Execution example:

$ python combine_ranks.py dNPC_COMB_ranked.txt dNPC_COMB dNPC_clip_string9_undirected_sans_ubi_for_diffusion_1_ranked.tab dNPC_mrna_string9_undirected_sans_ubi_for_diffusion_5_ranked.tab

Converted 7693 scores to 7693 percentile ranks.
Read scores for 7693 genes from dNPC_clip_string9_undirected_sans_ubi_for_diffusion_1_ranked.tab
Converted 8234 scores to 8234 percentile ranks.
Read scores for 8234 genes from dNPC_mrna_string9_undirected_sans_ubi_for_diffusion_5_ranked.tab
Read scores for total of 8450 genes from 2 files.
Converted 8450 scores to 8450 percentile ranks.
Wrote 8450 ranks to dNPC_COMB_ranked.txt.

