Fixed units-related problems in AWAC data workbooks:

Workbook
"data_importer_resources/myrmex_data_10-07-2014/myrmex_unit.xls":
- Sheet "units": added "kgCO2e" (key=5335) in category "Global Warming
Potential" (key=5016);
- Sheet "conversions": added conversion formula for "kgCO2e" from and to
main unit of category "Global Warming Potential" ("tCO2e").

Workbook
"data_importer_resources/awac_data_25-07-2014/AWAC-entreprise-calcul_FE.xls"
- Sheet "EFDB_V6":
- column H ("Unit IN"): replaced "m³" by "m3" and "euros" by "EUR";
- column K ("Unit OUT") replaced "kg CO2e" by "kgCO2e".
Implemented CodeLabel "sublists" (CodeConversionService,
CodeLabelService, etc.), adapted and fixed problems in data importers,
fixed minor problems