Shape-Out 2.6.7
- fix: correctly handle missing features on data export (#80)
- ref: cleanup (default arguments and PyQt5 object references)
- setup: bump dclab from 0.34.2 to 0.34.3 (set R_HOME)
- build: bump rpy2 from 3.4.2 to 3.4.5
- build: bump pyqtgraph from 0.12.1 to 0.12.2 and remove
colorbar export workarounds