Change "##Mutect Version=x.y" to "##MutectVersion=x.y"

[rasmushenningsson]

Bug Report

Affected tool(s) or class(es)

Mutect2

Affected version(s)

• Latest public release version [2.1]
• Latest master branch as of [2018-09-13]

Description

The VCF header line
"##Mutect Version=x.y"
causes problems for some VCF readers. Each header line is required to be a key-value pair and a space character is not expected in the key. (The VCF specification is not clear on this matter, but I've never encountered a space character in a VCF header key before.)
Making VCF files that are easily readable by downstream tools should be in the interest of Mutect2.

Steps to reproduce

Create a VCF file using Mutect2 and look at the header.

Expected behavior

output
"##MutectVersion=2.1"

Actual behavior

output
"##Mutect Version=2.1"

[davidbenjamin]

Thanks for spotting this, @rasmushenningsson!