Merge branch 'bug-18156-xnat-upload-feature' into personal/fetzer/cgs2015.06-release-xnat
Conflicts:
CMakeExternals/CTK.cmake
Modules/XNAT/files.cmake
Plugins/org.mitk.gui.qt.xnat/src/internal/QmitkXnatTreeBrowserView.cpp
Plugins/org.mitk.gui.qt.xnat/src/internal/QmitkXnatTreeBrowserView.h
Plugins/org.mitk.gui.qt.xnat/src/internal/QmitkXnatTreeBrowserViewControls.ui