Linkeddicom

This release includes radiotherapy features:
- Capturing the link between RTDose and RTPlan
- Capturing the link between RTPlan and RTStruct
- Calculating DVH parameters for **all** structures in a given combination of RTDose and RTStruct. This calculation is done using [dicompyler-core](https://github.com/dicompyler/dicompyler-core). The result of this calculation is a JSON-LD object (when calculated locally on disk), or the corresponding triples inserted in an RDF endpoint (when using the DICOM service to RDF endpoint).

Fixed issue with export (UTF-8 encoding)

Which means all features of Milestone 0.2.0 have been implemented
https://github.com/MaastrichtU-CDS/LinkedDicom/milestone/1

**Full Changelog**: https://github.com/MaastrichtU-CDS/LinkedDicom/compare/0.1.3...0.2.0

What's Changed
* jvsoest/issue1 by jvsoest in https://github.com/MaastrichtU-CDS/LinkedDicom/pull/5
* Feature/storage scp by jvsoest in https://github.com/MaastrichtU-CDS/LinkedDicom/pull/6