Removed the inclusion of CQFileDialogBtnGrp.h from CopasiFileDialog. It seems that this button group is actually no longer used by any class.
Removed the inclusion of CQFileDialogBtnGrp.h from CopasiFileDialog.
It seems that this button group is actually no longer used by any class.

jonasfoe/COPASI,copasi/COPASI,jonasfoe/COPASI,copasi/COPASI,jonasfoe/COPASI,jonasfoe/COPASI,copasi/COPASI,jonasfoe/COPASI,copasi/COPASI,jonasfoe/COPASI,jonasfoe/COPASI,copasi/COPASI,copasi/COPASI,jonasfoe/COPASI,copasi/COPASI,jonasfoe/COPASI,copasi/COPASI,copasi/COPASI