Schema name read from configuration is not requiered

In 2.1 we introduced to read the schema name from configuration, to be abel to produce same name as in 2.0. However we discovered, in last minute, that this was wrong. The schema name shoudl be DATEXIISchema_[model base version]_[tool major version]_[tool minor version].xsd

The last minute change did not revert back to the old rules, instead we just changed to configuration file. That will create a wrong schema name if you use a 2.0 model or if you use a future version. So the best is to revert back to old rules.