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Remove validation from Vat constructor and related test cleanup #126

Job	Run time
Coding standards	20s
Lint (8.3)	21s
Lint (8.2)	20s
Static analysis (8.2)	23s
Lint (8.4)	17s
Lint (8.1)	31s
Static analysis (8.1)	20s
Static analysis (8.3)	20s
Static analysis (8.4)	18s
Code coverage	19s
Tests (lowest, 8.2, ubuntu-latest)	13s
Tests (lowest, 8.4, windows-latest)	38s
Tests (lowest, 8.1, ubuntu-latest)	13s
Tests (lowest, 8.3, windows-latest)	45s
Tests (highest, 8.1, ubuntu-latest)	17s
Tests (lowest, 8.1, windows-latest)	44s
Tests (lowest, 8.3, ubuntu-latest)	19s
Tests (lowest, 8.2, windows-latest)	44s
Tests (lowest, 8.4, ubuntu-latest)	16s
Tests (highest, 8.1, windows-latest)	59s
Tests (highest, 8.2, windows-latest)	45s
Tests (highest, 8.3, windows-latest)	45s
Tests (highest, 8.3, ubuntu-latest)	16s
Tests (highest, 8.2, ubuntu-latest)	25s
Tests (highest, 8.4, ubuntu-latest)	18s
Tests (highest, 8.4, windows-latest)	38s
	11m 44s

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