Add conda dev env and pytest settings in setup.cfg

conda-env/dev.yml

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+# Conda pcmdi_metrics development environment
+name: pcmdi_metrics_dev
+channels:
+  - conda-forge
+  - defaults
+dependencies:
+  # Base
+  # ==================
+  - python=3.9.7
+  - pip=21.2.4
+  - numpy=1.21.3
+  - matplotlib=3.4.3
+  - cdms2=3.1.5
+  - genutil=8.2.1
+  - cdutil=8.2.1
+  - cdp=1.7.0
+  - proj4=6.1.1
+  # Testing
+  # ==================
+  - pytest=6.2.5
+  - pytest-cov=3.0.0
+  # Developer Tools
+  # ==================
+  - jupyterlab=3.2.1
+  - nb_conda=2.2.1
+  - nb_conda_kernels=2.3.1
+
+prefix: /opt/miniconda3/envs/pmcdi_metrics_dev

setup.cfg

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+[tool:pytest]
+junit_family=xunit2
+addopts = --cov=pcmdi_metrics --cov-report term --cov-report html:tests_coverage_reports/htmlcov --cov-report xml:tests_coverage_reports/coverage.xml -s --ignore tests/deprecated
+python_files = tests.py test_*.py