[LIB-154] Fix forward solution
[LIB-154] Fix forward solution

LorenzE/mne-cpp,mne-tools/mne-cpp,chdinh/mne-cpp,LostSign/mne-cpp,LorenzE/mne-cpp,chdinh/mne-cpp,LorenzE/mne-cpp,ViktorKL/mne-cpp,chdinh/mne-cpp,mne-tools/mne-cpp,ViktorKL/mne-cpp,mne-tools/mne-cpp,chdinh/mne-cpp,LostSign/mne-cpp,mne-tools/mne-cpp,LorenzE/mne-cpp,chdinh/mne-cpp,mne-tools/mne-cpp,chdinh/mne-cpp,mne-tools/mne-cpp