Tests

More general truncation and algorithm selection in orth/null #104

Job	Run time
Tests (1, windows-latest) / Julia 1 - windows-latest	18m 1s
Tests (1, macOS-latest) / Julia 1 - macOS-latest	11m 48s
Tests (lts, macOS-latest) / Julia lts - macOS-latest	9m 44s
Tests (lts, ubuntu-latest) / Julia lts - ubuntu-latest	14m 28s
Tests (lts, windows-latest) / Julia lts - windows-latest	15m 48s
Tests (1, ubuntu-latest) / Julia 1 - ubuntu-latest	16m 54s
	1h 26m 43s

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