ENH: Add support for multiple clients
ENH: return stc when applying stc.transform_data
STY
ENH: add transform method to SourceEstimate class
WIP: add transform method to SourceEstimate class
WIP: add transform method to SourceEstimate class
WIP: add transform method to SourceEstimate class
Add tests for multiclient setup
FIX read_fiducials():  set points' coord_frame
WIP: test SourceEstimate transform method
FIX fiducials IO TEST
ENH write_fiducials:  catch fiducials with inconsistent coord_frame entries
STY: Use more consistent form of variable numclients -> n_clients
WIP: test SourceEstimate transform method
WIP: test SourceEstimate transform method
Merge pull request #842 from adykstra/return_stc_data_transform

ENH:  add transform method to SourceEstimate class
Merge pull request #856 from christianmbrodbeck/fid_io

FIX read_fiducials():  set points' coord_frame
ENH:  make spacing parameter consistent between functions
DOC
DOC