Make column names in ExtractIlluminaBarcodes public

[magicDGS]

Description

The column header names in ExtractIlluminaBarcodes are private constants that cannot be used to check if a file has this header names programmatically. This PR makes them public to allow re-usage for similar kind of data.

In addition, this constants are added to the documentation annotations to avoid possible inconsistencies with the actual value.

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Checklist (never delete this)

Content

• Added or modified tests to cover changes and any new functionality
• Edited the README / documentation (if applicable)
• All tests passing on Travis

Review

• Final thumbs-up from reviewer
• Rebase, squash and reword as applicable

[coveralls]

Coverage remained the same at 76.894% when pulling 75b8701 on magicDGS:dgs_ExtractIlluminaBarcodes_column_constants into fd16f8a on broadinstitute:master.

[yfarjoun]

👍

[magicDGS]

Thanks @yfarjoun!