cleanup (DOC, pep8 etc.)
ENH kit2fiff_gui:  threaded conversion processing
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