Bugfixes April 2020

[BSchilperoort]

Fixes #104, #105, #107

• Re-adds the _sections attribute when calling datastore.sections if it is missing.
• Obtains attributes from dataset when creating a datastore from a dataset
• shift_double_ended can be silenced (no print to console)
• Check if variance kwargs are passed to calibration_double_ended for the wls calibration. Return a clear error if they are missing.

[bdestombe]

Great Bart!
It fails travisCI though.. But it has nothing to do with your changes. Sphinx updated its API in version 3.0.0, and causes troubles to one of its unmaintained plugins. I'd guess for the same reason as described here: pcdshub/pcdsdevices#410 .

Let's merge this PR and create a new issue/PR for the Sphinx problem. The documentation won't be updated until the Sphinx problem is fixed.

[bdestombe]

Great work!

[codecov]

Codecov Report

Merging #109 into master will decrease coverage by 0.00%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##           master     #109      +/-   ##
==========================================
- Coverage   74.18%   74.18%   -0.01%     
==========================================
  Files           8        8              
  Lines        3138     3145       +7     
  Branches      672      677       +5     
==========================================
+ Hits         2328     2333       +5     
- Misses        601      602       +1     
- Partials      209      210       +1     

Impacted Files	Coverage Δ
src/dtscalibration/datastore.py	76.14% <75.00%> (-0.03%)	⬇️
src/dtscalibration/datastore_utils.py	89.92% <100.00%> (ø)

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