bugfix for Expression.Disjunction: was a conjunction before (#153) #382

Job	Run time
Test on stable (Debug)	9m 12s
Test and Deploy on latest (Debug)	17m 27s
Indepth Tests (Debug, all libraries)	16m 35s
Test on stable (Release)	10m 29s
Test and Deploy on latest (Release)	17m 35s
Indepth Tests (Debug, no libraries)	13m 38s
Indepth Tests (Release, all libraries)	15m 25s
Indepth Tests (Release, no libraries)	13m 27s
Email notification	4s
	1h 53m 52s

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