[#21] Makefile: Introduce UN/LOCODE overrides and copy it by the recipe

* Introduce `unlocode-CodeList_overrides.csv` that contains missing details
 for locodes from the main `unlocode-CodeList.csv` file;
* Fix `Makefile`;
* Add info to `README.md`.

Signed-off-by: Airat Arifullin <a.arifullin@yadro.com>

Makefile

@@ -41,8 +41,11 @@ in/unlocode-SubdivisionCodes.csv: $(DIRS)
 in/unlocode-CodeList.csv: $(DIRS)
 	zcat data/unlocode-CodeList.csv.gz > in/unlocode-CodeList.csv
 
+in/unlocode-CodeList_overrides.csv: $(DIRS)
+	cp data/unlocode-CodeList_overrides.csv in/unlocode-CodeList_overrides.csv
+
 # Generate locode_db BoltDB file
-locode_db: in/unlocode-CodeList.csv in/unlocode-SubdivisionCodes.csv in/continents.geojson in/airports.dat in/countries.dat $(FROST_LOCODE)
+locode_db: in/unlocode-CodeList.csv in/unlocode-SubdivisionCodes.csv in/continents.geojson in/airports.dat in/countries.dat in/unlocode-CodeList_overrides.csv $(FROST_LOCODE)
 	$(FROST_LOCODE) generate \
 	--airports in/airports.dat \
 	--continents in/continents.geojson \

README.md

@@ -16,6 +16,8 @@ This repository tools generate UN/LOCODE database for FrostFS using data from
 following sources:
 - [UN/LOCODE](https://unece.org/trade/cefact/UNLOCODE-Download) database in CSV
   format, licensed under the [ODC Public Domain Dedication and Licence (PDDL)](http://opendatacommons.org/licenses/pddl/1-0/)
+- [Improved UN/LOCODE](https://raw.githubusercontent.com/cristan/improved-un-locodes/86b2e96f17289ddb62f52dcfcfac520bc1ca002b/data/code-list-improved.csv) database
+  that contains more details about LOCODEs (like coordinates) which may miss in UN/LOCODE database.
 - [OpenFlight Airports and
   Countries](https://raw.githubusercontent.com/jpatokal/openflights/master/data/)
   databases, licensed under the [GNU AGPL-3.0