Python-sofa

- Switched spherical coordinate definition from azimuth and colatitude (0...180) angles to azimuth and elevation (90...-90) to conform to SOFA specifications.
- Provided a more direct access to variable and attribute creation within the dataset
- Reworked the initialization process and DataType creation
- Reworked RoomTypes
- Ensured conventions conform to SOFA 1.0

- Fixed issues in relative coordinate access.

- Fixed issues in array accessing and coordinate system conversion.

- Initial release.