Bug fix missing sample ID in median coverage

[VJalili]

This PR fixes the medianCoverage.R script, which fails to report the sample ID in the output.

 > printf "Chr\tStart\tEnd\tNA12878\nchr1\t10000\t10100\t1014\nchr1\t10100\t10200\t378\nchr1\t10200\t10300\t218\n" > test_input.bed

Current output:

> Rscript src/WGD/bin/medianCoverage.R test_input.bed -H test_output.bed
> cat test_output.bed

#sample_id	Med_withoutZeros
378	NA

Note that the sample ID is missing.

Corrected output:

> Rscript src/WGD/bin/medianCoverage.R test_input.bed -H test_output.bed
> cat test_output.bed

#sample_id	Med_withZeros	Med_withoutZeros
NA12878	378	NA

Testing

Successfuly tested EvidenceQC, the output medianCov.transposed.bed looks as expected.

gs://fc-bd728187-9620-4fee-af18-967e29390e66/submissions/69e133a4-6d19-42a0-bfce-340fdf13e895/EvidenceQC/150a181f-9d12-45cf-b81a-59cdaa5e135a/call-MedianCov/MedianCov/e7667941-a396-4f15-95fb-39ba5d5a64e0/call-CalcMedCov/all_samples_medianCov.transposed.bed

[VJalili]

Thanks, @mwalker174!