[LIB-161] Add new function to fiff trans
[LIB-161] Add new function to fiff trans

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