TEST scale_mri:  use smaller source space and python setup_source_space()
DOC add_source_space_distances() error message
TEST scale_source_space() with distances (BK)
FIX scale_source_space():  add distances with 3 scaling params
OPT TEST:  test_scale_mri()
OPT TEST test_scale_mri():  delete all but one label file
FIX: typo in report causing by ecg channel names
FIX bug related to loading datablocks.

datablocks can have a length different than the sampling frequency. The current code assumes that the sampling frequency and the number of samples per block are the same. This turns out to be a bad assumption.
FIX indexing error.

chan_data is 1d so the index should be 0.
FIX stim channel interpolation
ADD padding and PEP8
Merge pull request #1574 from t3on/tb-edf-FIX

FIX bug related to loading datablocks.
DOC whats-new
DOC:  whats-new
Merge pull request #1478 from christianbrodbeck/fix-scale-ss

Fix scale_source_space
more informative warning
update manifest
ADD digital mask option
ADD test
FIX masking to block matching ones