Fix pytest failures in PR

Currently #249 fails the pytest tests with the following error
Run pytest --cov=pgfinder
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============================= test session starts ==============================
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platform linux -- Python 3.9.18, pytest-7.4.4, pluggy-1.3.0
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Matplotlib: 3.8.2
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Freetype: 2.6.1
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rootdir: /home/runner/work/pgfinder/pgfinder/lib
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configfile: pyproject.toml
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testpaths: tests
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plugins: regtest-1.5.1, xdist-3.5.0, mpl-0.16.1, cov-4.1.0
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collected 17 items
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tests/test_matching.py ...F                                              [ 23%]
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tests/test_pgio.py ......                                                [ 58%]
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tests/test_regression.py ...                                             [ 76%]
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tests/test_utils.py ...                                                  [ 94%]
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tests/test_validation.py .                                               [100%]
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=================================== FAILURES ===================================
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_______________________ test_pick_most_likely_structures _______________________
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    def test_pick_most_likely_structures() -> None:
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        """Test picking the most likely structure based on ppm"""
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        long_df = pd.read_csv(RESOURCES / "long_results.csv")
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        wide_df = pd.read_csv(RESOURCES / "wide_results.csv")
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        reshaped_long_df = pick_most_likely_structures(long_df, 1)
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>       pd.testing.assert_frame_equal(reshaped_long_df, wide_df, check_dtype=False)
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tests/test_matching.py:41: 
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_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
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testing.pyx:55: in pandas._libs.testing.assert_almost_equal
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    ???
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_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
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>   ???
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E   AssertionError: DataFrame.iloc[:, 8] (column name="Inferred structure (consolidated)") are different
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E   
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E   DataFrame.iloc[:, 8] (column name="Inferred structure (consolidated)") values are different (50.0 %)
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E   [index]: [0, 1, 2, 3, 4, 5]
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E   [left]:  [gm|0, gm-AEJN|1,   gm-AEJGG|1,   gm-AEJX|1, nan, nan, gm-AEJR|1, nan]
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E   [right]: [gm|0, gm-AEJN|1,   gm-AEJGG|1,   gm-AEJX|1, nan, nan, gm-AEJR|1, nan]
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E   At positional index 2, first diff: nan != nan
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testing.pyx:173: AssertionError
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---------- coverage: platform linux, python 3.9.18-final-0 -----------
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Name                        Stmts   Miss  Cover
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-----------------------------------------------
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pgfinder/__init__.py           13      0   100%
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pgfinder/errors.py              1      0   100%
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pgfinder/find_pg.py            70     70     0%
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pgfinder/gui/__init__.py        0      0   100%
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pgfinder/gui/internal.py       22      1    95%
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pgfinder/gui/shim.py           14     14     0%
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pgfinder/io.py                 14     14     0%
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pgfinder/logs/__init__.py       0      0   100%
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pgfinder/logs/logs.py          22     12    45%
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pgfinder/matching.py          164      2    99%
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pgfinder/pgio.py              102     23    77%
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pgfinder/utils.py              30      0   100%
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pgfinder/validation.py         43     16    63%
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-----------------------------------------------
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TOTAL                         495    152    69%
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=========================== short test summary info ============================
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FAILED tests/test_matching.py::test_pick_most_likely_structures - AssertionError: DataFrame.iloc[:, 8] (column name="Inferred structure (consolidated)") are different
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DataFrame.iloc[:, 8] (column name="Inferred structure (consolidated)") values are different (50.0 %)
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[index]: [0, 1, 2, 3, 4, 5]
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[left]:  [gm|0, gm-AEJN|1,   gm-AEJGG|1,   gm-AEJX|1, nan, nan, gm-AEJR|1, nan]
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[right]: [gm|0, gm-AEJN|1,   gm-AEJGG|1,   gm-AEJX|1, nan, nan, gm-AEJR|1, nan]
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At positional index 2, first diff: nan != nan
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======================== 1 failed, 16 passed in 35.98s =========================
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Error: Process completed with exit code 1.
This needs fixing and the PR merging (presumably) before progressing with work.
Mesnage-Org / pgfinder

Fix pytest failures in PR #260
