Shapeout2

- enh: add busy cursors wherever it seems fitting
- setup: bump dclab from 0.24.7 to 0.26.1 (volume-deformation
isoelasticity lines, improved DCOR caching)

- fix: opening sessions did not work due to missing slot decorator
- fix: in some cases the temperature/viscosity setting was not
correctly written to the UI for individual slots when switching
between slots with fundamentally different settings (e.g. channel
and reservoir)
- fix: KeyError when switching between slots with different
temperature options
- setup: bump dclab from 0.23.0 to 0.24.7 (equidistant isoelastics,
faster polygon filtering, crosstalk correction failed due to
improper configuration update since Shape-Out 2.1.1)

- fix: ValueError when trying to compute contour spacing, because no
datasets are selected for a plot
- fix: coloring scatter plot by feature did not work when the feature
contains nan values
- fix: search path in session should not be filename but its
directory
- setup: bump dclab from 0.22.5 to 0.23.0 (possible HDF5 export issue)

- fix: include private datasets when searching with DCOR API Key
- fix: remove UI option to compute Young's modulus for reservoir data
(new "emodulus enabled" key in pipeline slot)
- fix: `Pipeline` object not returned by `session.open_session`
- setup: bump dclab from 0.22.1 to 0.22.5 (improve contour retrieval
for mask images with artefacts, disable computation of Young's
modulus for reservoir measurements)

- feat: basic DCOR support
- fix: improved session support (older pre-release sessions)
- docs: add DCOR guick guide
- enh: export event image via context menu in Quick View (35)
- setup: bump dclab from 0.21.1 to 0.22.1 (DCOR support)

- setup: bump dclab from 0.20.3 to 0.21.1
- docs: add terminology section (12)