reduce from 3 to 2 packages

src/nominatim_db/data/country_info.py

@@ -11,10 +11,10 @@ from typing import Dict, Any, Iterable, Tuple, Optional, Container, overload
 from pathlib import Path
 import psycopg2.extras
 
-from nominatim_core.db import utils as db_utils
-from nominatim_core.db.connection import connect, Connection
-from nominatim_core.errors import UsageError
-from nominatim_core.config import Configuration
+from ..db import utils as db_utils
+from ..db.connection import connect, Connection
+from ..errors import UsageError
+from ..config import Configuration
 from ..tokenizer.base import AbstractTokenizer
 
 def _flatten_name_list(names: Any) -> Dict[str, str]:

src/nominatim_db/data/postcode_format.py

@@ -11,7 +11,7 @@ format.
 from typing import Any, Mapping, Optional, Set, Match
 import re
 
-from nominatim_core.errors import UsageError
+from ..errors import UsageError
 from . import country_info
 
 class CountryPostcodeMatcher: