update URL from gforge to svn.ihe-europe.net

Authentication-Simulator/installation.md

CTS/installation.md

EPR-ATC-Simulator/installation.md

EPR-Assertion-Provider-Simulator/installation.md

EVS-Client/pixelmed_and_dicom3tools.md

Gazelle-Calibration/installation.md

Gazelle-STS/installation.md

Gazelle-STS/user.md

Gazelle-Transformation-Service/installation.md

Gazelle-X-Validator-Rule-Editor/installation.md

Gazelle-X-Validator-Rule-Editor/user.md

Schematron-Validator/installation.md

XDW-Simulator/installation.md