Add code duplication checker

S-01725

As a ExSeisDat Developer I want to include a test for code duplication to maximize the maintainability of the code.

PreDev Notes:

This is needed for the review process, which says code duplication should be below some as-yet unnamed value. Need to find a good tool for this. Ideally it could be run from a developer's own computer.

Implementation Notes:

ADDME

System Test Changes:

ADDME

Bug Fixes:

ADDME

C++ API Changes:

ADDME

C API Changes:

ADDME

Success Criteria:

It should be possible to run a test which returns how much of the code is duplicated. The test should fail if it's over some number, and that number should be tunable.

CREATED ON - 08/05/2018

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