A simple wrapper around bool so that it can be read as a word: true/false, on/off, yes/no, any/none. Also accepts 0/1 as a string and shortcuts t/f, y/n.
IOobject io("surfaceFilmProperties", mesh.time().constant(), mesh, IOobject::READ_IF_PRESENT, IOobject::NO_WRITE, IOobject::NO_REGISTER)