Add CalibrationStore implementatation using the database

[gdetrez]

Add migration script to create the tables, CalibrationStore and integration tests.

I didn't change the data model itself: the information stored in the database is the same as what was in the .ccc files and with approximately the same structure.

The default calibration is added to the database directly as part of the migration. This makes the code simpler (no special cases) but the tests have to take it into account.

[codecov-io]

Codecov Report

Merging #324 into master will increase coverage by 0.67%. The diff coverage is 98.26%.

@@            Coverage Diff            @@
##           master    #324      +/-   ##
=========================================
+ Coverage   36.52%   37.2%   +0.67%     
=========================================
  Files         165     167       +2     
  Lines       16421   16590     +169     
  Branches     2890    2922      +32     
=========================================
+ Hits         5998    6172     +174     
+ Misses      10003    9999       -4     
+ Partials      420     419       -1

Impacted Files	Coverage Δ
...ersions/f9a3e426a0ce_create_calibrations_tables.py	93.75% <93.75%> (ø)
scanomatic/data/calibrationstore.py	98.98% <98.98%> (ø)
...server_data/js/src/components/ScanningJobPanel.jsx	100% <0%> (ø)	:arrow_up:
.../ui_server_data/js/src/components/ScanningRoot.jsx	100% <0%> (ø)	:arrow_up:
scanomatic/data_processing/phases/segmentation.py	74.93% <0%> (+1.11%)	:arrow_up:
...r_data/js/src/containers/ScanningRootContainer.jsx	100% <0%> (+10%)	:arrow_up:

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