* Adding test_dupe_files.py.
Merge remote-tracking branch 'origin/dev' into dev
* Updated test_dupe_files.py with code from test_diff.py.
* Completed test_identical_trees() in test_dupe_files.py. Completes issue #52.
* Added and debugged test_single_tree_with_duplicates() to test_dupe_files.py, which resolves issue #53.
* Removed some commented code from test_dupe_files.py.
* Added and debugged test_output_option() to test_dupe_files.py. Closes issue #62.
* Added and debugged test_dissimilar_trees() to test_dupe_files.py. Closes issue #54.
* Added and debugged test_single_tree_without_duplicates() to test_dupe_files.py. Closes issue #55.
* Added a new schema, schema 3, to brd_unit_base.py.
* Adding test_dupe_trees.py from test_dupe_files.py.
* Cleaned some commented code out of test_dupe_files.py.
* Fixed some python3 conversion issues related to dupe_trees.
* Fleshed out TestDupeTrees.
* Added and debugged test_identical_trees() to test_dupe_trees.py. Resolves issue #63.
* Added test_dissimilar_trees() to test_dupe_trees.py, however it is not generating expected output. Suspect bug in brd. Added issue #78.
* Added test_output_option() to test_dupe_trees.py, however it is not generating an output file. Suspect bug in brd. Added issue #79.