Add tests for ensuring equal results with older versions

tests/neurax_identical/__init__.py

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+# This folder checks whether the new version of the code produces **exactly** the same
+# simulation results as previous versions.

tests/neurax_identical/basic_modules.py

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+def test_compartment():
+    pass
+
+
+def test_branch():
+    pass
+
+
+def test_cell():
+    pass
+
+
+def test_net():
+    pass

tests/neurax_identical/radius_and_length.py

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+def test_radius_length_compartment():
+    pass
+
+
+def test_radius_length_branch():
+    pass
+
+
+def test_radius_length_cell():
+    pass
+
+
+def test_radius_length_net():
+    pass

tests/neurax_identical/swc.py

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+def test_swc_cell():
+    pass
+
+
+def test_swc_net():
+    pass

tests/neurax_vs_neuron/__init__.py

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+# This folder that contains tests which ensure that the results are almost identical
+# to the results of the neuron toolbox.