used script:
    t = re.sub(r'new QString\(("[^"]*?")\)', r'###NEW(\1)', t)
    t = re.sub(r'QString\(("[^"]*?")\)(\s*\+\s*)', r'###ADD(\1)\2', t)
    t = re.sub(r'QString\(("[^"]*?")\)(\s*\.)', r'###ADD(\1)\2', t)
    t = re.sub(r'QString\(("[^"]*?")\)', r'\1', t)
    t = re.sub(r'###NEW\(("[^"]*?")\)', r'new QString(\1)', t)
    t = re.sub(r'###ADD\(("[^"]*?")\)', r'QString(\1)', t)

Extend them to CMakeLists.txt,
and bundle the checks in one CMake module.

cmake/bornagain/modules -> cmake/modules
cmake/bornagain/scripts -> cmake/configurables
cmake/generic/modules   -> cmake/extensions

As recommended by
https://google.github.io/styleguide/cppguide.html#The__define_Guard

Provide doxygen comments.
Use seconds from the onset.
Internal data now struct, not class.

Fix bug with application crash when trying to delete multilayer with 3D view in loced mode (http://apps.jcns.fz-juelich.de/redmine/issues/2461)