CU-8699np02n Improve legacy conversion (3) (#30)

* CU-8699np02n: Update CDB legacy conversion so that it works with CDBs with no name_isupper attribute

* CU-8699np02n: Add method to legacy converter to convert any config

* CU-8699np02n: Fix config legacy conversion

* CU-8699np02n: Add a few simple tests for Config legacy conversion

* CU-8699np02n: Add a little more sophistication to general config conversion tests

* CU-8699np02n: Simplify MetaCAT deserialisation from legacy data

Author: mart-r

medcat-v2/medcat/components/addons/meta_cat/meta_cat.py

@@ -180,6 +180,9 @@ def deserialise_from(cls, folder_path: str, **init_kwargs
             cnf = init_kwargs['cnf']
         else:
             config_path = os.path.join(folder_path, "meta_cat", "config")
+            if not os.path.exists(config_path):
+                # load legacy config (assuming it exists)
+                config_path += ".dat"
             logger.info(
                 "Was not provide a config when loading a meta cat from '%s'. "
                 "Inferring config from file at '%s'", folder_path,