ENH coreg_gui:  threaded background processing
FIX coreg_gui:  deal with empty subjects_dir
ENH  SubjectSelector:  add "create fsaverage" option
RawKIT:  STY: method names to set digitizer data;  RF: integrate get_dig_points() into RawKIT.set_dig_neuromag()
FIX coreg_gui / fiducially panel:  don't allow locking incomplete fiducials
DOC:  manual
ENH coreg_gui:  interactivity

 - Ask for MNE_ROOT and FS_HOME when not set
 - progress bar when creating fsaverage
API:  expose more functions
ENH coreg_gui:  disable immediate interpretation of scale1 parameter upon typing

(This is not as simple for other parameters because they rely on the ArrayEditor)
ENH coreg_gui:  add resolution option to GUI viewer PointObject for head shape display
FIX coreg_gui:  NewMriDialog feedback behavior
STY fiducials_gui:  make attribute names all lowercase
ENH coreg_gui:  fiducials picker uses cell picker
ENH fiducials_gui:  one array editor to edit current fiducial position
ENH coreg_gui:  3 column view

 - add alternative views to PointObject for individual points and point cloud
ENH kit2fiff_gui:  specify view height
DOC/STY
ENH transforms:  supplant coord_trans () and transform_ALS_to_RAS() with normal trans
FIX coreg_gui:  don't allow mne_setup_source_space without mne_prepare_bem_model
FIX coreg_gui:  qt4 backend compatibility