Make data_mutations_uncalled and meta_mutations_uncalled files for cBioPortal

[stevekm]

Need to update the samples fillout worklflow to create data_mutations_uncalled.txt and meta_mutations_uncalled.txt files

might be able to bundle it into this script;
https://github.com/mskcc/helix_filters_01/blob/master/bin/update_fillout_maf.py

@timosong

[timosong]

Requirements for data_mutations_uncalled.txt
For any row where t_alt_count == 0, set Mutation_Status to UNCALLED, and place in file called data_mutations_uncalled.txt
These rows are mutually exclusive to data_mutations_extended.txt.

Requirements for meta_mutations_uncalled.txt
File format is similar to this: https://github.com/cBioPortal/datahub/pull/1418/files#diff-54c74f8a4d51dd53d8b56d293f21f02f78c035a9dded8928b957de3a3ae72c64
Only variable line is:
cancer_study_identifier: glioma_msk_2018
This should be the name of the study id

[timosong]

@stevekm This filter requirement must be extended to not only t_alt_count == 0 but also:
If fillout == True then place mutation row in data_mutations_uncalled.txt regardless of depth.