Make tar OS-agnostic in perl code

[poneill]

Background:

A concise description of why we're pursuing this task.

See #277 for background. We'll need to make the use of tar OS-agnostic in the perl code too if we want to run the core annotator on macosx.

Completion Criteria:

What is the goal, and how do we know this task is accomplished?

The goal would be run the successfully run the annotator on macosx.

Implementation Summary

Give enough technical detail for a teammate to understand the proposed solution.

We could take an approach similar to #276, which makes tar OS-agnostic in Python code.