linux compilation fix
Merge branch 'development' of https://github.com/rkhlebnikov/MITK into development
Merge branch 'development' of https://github.com/rkhlebnikov/MITK into development
Merge branch 'development' of https://github.com/rkhlebnikov/MITK into development
Merge branch 'development' of https://github.com/rkhlebnikov/MITK into development
Merge branch 'development' of https://github.com/rkhlebnikov/MITK into development
Merge branch 'development' of https://github.com/rkhlebnikov/MITK into development
Merge branch 'development' of https://github.com/rkhlebnikov/MITK into development
Linux rendering and compilation fixes