working on 0.0.31 Release

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* Fixed #211 ECDC-templates: change URL to for_url()
* Fixed #213 WHO-template: change URL to for_url()
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* Issue #195 RkiVaccinationImport.get_daterep_missing_in_vaccination_data(): native SQL to SQLalechemy Query
* Fixed #83  WhoImport.get_new_dates_as_array() SQLalchemy instead of SQL
* Fixed #219 WhoImport.countries() SQLalchemy instead of SQL
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* Issue #207 remove deprecated: database.port
* Issue #208 remove deprecated: database.run_run_with_debug
* Issue #209 remove deprecated: database.ITEMS_PER_PAGE
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* Issue #210 database.py: logging for Celery on Windows
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* Fixed #196 OwidImport.get_new_dates_reported_as_array() needs implementation
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* Issue #212 implement OwidService.task_database_drop_create()
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* Issue #214 implement OwidServiceUpdate.update_dimension_tables_only()
* Issue #215 implement OwidServiceUpdate.update_fact_table_incremental_only()
* Issue #216 implement OwidServiceUpdate.update_fact_table_initial_only()
* Issue #217 implement OwidServiceUpdate.update_star_schema_incremental()
* Issue #218 implement OwidServiceUpdate.update_star_schema_initial()
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