Adds usage statement to UmiAwareMarkDuplicatesWithMateCigar that it shouldn't be used with RNAseq or other technologies with long gaps.

[fleharty]

Description

This adds a usage statement to UmiAwareMarkDuplicatesWithMateCigar that informs the user that this tool should not be used with RNAseq, or other sequencing technologies that have large alignment gaps. Addressing issue #953

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Checklist (never delete this)

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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

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[coveralls]

Coverage remained the same at 77.055% when pulling bfb1224 on mf_umiUsageStatement into 4a846f3 on master.

[fleharty]

Waiting for some issues to be resolved from #953 before I make this pull request again.

[coveralls]

Coverage remained the same at 77.055% when pulling bfb1224 on mf_umiUsageStatement into 4a846f3 on master.