FIX TreeModel: handle absence of default field value
FIX load.fiff:  load sqd files
FIX setup:  work with Canopy distribution

- py2app -A
- bash command
TEST:  add some tests
ENH WxTerm:  don't print invalid interpreter intro
ENH Makefile:  add `clean-py` option to remove *.pyo and *.pyc files
ENH Factor:  sort .cells naturally
FIX plot.utsnd:  x-axis in ms
FIX plot.TopoButterfly:  remove stray "t = 0" label
RM default plotting range
EXA:  simple meg
DOC
SETUP:  require mne