Sdmxthon

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**Added**

**Changes**
- Implemented better understanding of inFile in read_xml.
- Adapted to_vtl_json() to new format.

**Bugfixes**

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**Added**
- Implemented several formats on validFrom/validTo, as shown on issue 17

**Changes**
- Redesigned reading process based on xmltodict
- Implemented custom writing process based on generators. Reduced memory footprint and improved performance and maintainability. Implemented Generic Series writing process.
- Improved overall performance on semantic validation.
- Cleanup of old parsers and writing methods. Simplified code for better maintainability.
- Model changes:
- Deleted 'dataset' on data retrieval
- Changed keys of message.content on Metadata Type.

**Bugfixes**

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Development version (Yanked Release), changes are implemented in 1.2.

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**Added**

**Changes**

**Bugfixes**
- Fixed bug on Dataflow with constraints parsing.

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**Added**

**Changes**

**Bugfixes**
- Fixed bug on Generic writing with only one dimension or attribute.

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**Added**

**Changes**
- Added support for strings in all API methods. Restricted path to os.Pathlike


**Bugfixes**
- Fixed bug on Series Constraints duplicated rows.