Continuous integration

Add a test to check that LabelledGeneric works with keyword fields (#… #197

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Run time

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Job	Run time
Build (stable, y)	11s
Check (stable, y)	18s
Doc check (stable)	15s
Build (stable, n)	17s
Check (stable, n)	17s
Doc check (nightly)	18s
Build (nightly, y)	18s
Check (nightly, y)	19s
Build (nightly, n)	21s
Check (nightly, n)	14s
Basic sanity checks	15s
Test Suite (stable)	34s
Test Suite (nightly)	27s
	4m 4s