MAINT: further tests and docs

Summary

The extern keyword of the yml model parser is now better tested and documented.

Test Environment

How to set up a test environment for manual testing?

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• All automated tests pass
• Reference related Issues
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  • Intent of new code
  • Problems with old code
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• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md
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integrationtests/insert_model.py

@@ -8,7 +8,7 @@ from caosadvancedtools.models.parser import parse_model_from_yaml
 
 def main():
 
-    # for teseting existing data model parts for the YANL Interface
+    # for testing existing data model parts with the YAML Interface
     db.RecordType(name="TestRT1", datatype=db.TEXT).insert()
     db.Property(name="TestP1", datatype=db.TEXT).insert()
 
@@ -21,7 +21,8 @@ def main():
         al.insert()
 
     h5model = db.Container()
-    h5file = h5py.File('extroot/ExperimentalData/2010_TestProject/2019-02-03/hdf5_dummy_file.hdf5', 'r')
+    h5file = h5py.File(
+        'extroot/ExperimentalData/2010_TestProject/2019-02-03/hdf5_dummy_file.hdf5', 'r')
     H5CFood.create_structure(h5file, create_recordTypes=True, collection=h5model,
                              root_name="ExampleH5")
     h5model = DataModel(h5model)