[BUG]wikidataid is not unique and labels are not handled as lists

[WolfgangFahl]

Describe the bug
The wikidataid for countries, regions and cities should be unique there might be multiple labels but not multiple entries under the same id

To Reproduce
use primarykey of pyLoDStorage

Expected behavior
Primary key should be set and index should be automatically created.

[WolfgangFahl]

0:Arlington County (None - None)
1:Rincón (None - None)
2:Happy Valley-Goose Bay (None - None)
3:St. Petersburg (None - None)
4:Abele (None - None)
======================================================================
FAIL: testCityManagerFromJSONBackup (tests.test_location.TestLocationHierarchy)
tests the loading and parsing of the cityList form the json backup file
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Traceback (most recent call last):
  File "/Users/wf/Documents/pyworkspace/geograpy3/tests/test_location.py", line 262, in testCityManagerFromJSONBackup
    citiesByWikiDataId=self.checkNoDuplicateWikidataIds(cityManager)
  File "/Users/wf/Documents/pyworkspace/geograpy3/tests/test_location.py", line 195, in checkNoDuplicateWikidataIds
    self.assertEqual(len(duplicates),0)
AssertionError: 5 != 0