allow bads in layout
improve and fix test
set proper cal for stim channels
Merge pull request #1673 from dengemann/fix-egi-cal-stim

BUG: set proper cal for stim channels
Merge pull request #1672 from dengemann/viz-maint-2

MAINT: allow bads in layout
Add auto-reg code and a first example
more comments on method options
trim fixes nanmean