Shapeout2

- fix: false alarms about wrong pyqtgraph version on startup
(removed the responsible code, because there are now more regular
releases of pyqtgraph)
- enh: allow passing session files, datasets, and filters via the
command line (88)
- enh: associate the .so2 file format with Shape-Out on Windows (88)
- build: migrate to Inno Setup 6
- ref: avoid pyqtgraph DeprecationWarning due to `translate`

- fix: migrate to pg.ColorBarItem (with some manual patches from
upstream) to resolve issues with SVG export (87)
- fix: units of viscosity is mPa*s (91)
- setup: bump pyqtgraph from 0.12.0 to 0.12.1
- setup: bump dclab from 0.33.3 to 0.34.2
- ci: fix build issues for macOS

- fix: HTML-escape plot titles and axis labels (82)

- build: pin rpy2 to 3.4.2 on Windows (84)

- setup: migrate to pyqtgraph 0.12.0
- setup: bump dclab from 0.33.1 to 0.33.3
- docs: fix rtd build

- setup: remove deprecated setup.py test
- setup: bump dclab to 0.33.1 (filters were ignored when exporting
trace data to hdf5,
see https://github.com/DC-analysis/DCKit/issues/17)