More general truncation and slicing (#159) #316

Job	Run time
IntegrationTest (GradedArrays) / GradedArrays	11m 41s
IntegrationTest (KroneckerArrays) / KroneckerArrays	9m 44s
IntegrationTest (ITensorBase) / ITensorBase	3m 29s
IntegrationTest (FusionTensors) / FusionTensors	7m 54s
IntegrationTest (NamedDimsArrays) / NamedDimsArrays	4m 59s
IntegrationTest (QuantumOperatorDefinitions) / QuantumOperatorDefinitions	5m 22s
	43m 9s

Provide feedback