Evaluate Relationals when casting to bool#354

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qthequartermasterman wants to merge 9 commits intosymengine:masterfrom

qthequartermasterman:relational_bool

Commits on Jun 4, 2021

Override __bool__ in Relational, so that it returns whatever the boolean evaluation is, instead of always True. Resolves #312
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Commits on Jun 5, 2021

Update test_eval.py
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Commits on Jun 8, 2021

Include workaround for environments without sympy.
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Fix tests so that they will accept a ValueError for hard relational evaluations.
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Eliminated all approximations in Relational boolean evaluation. Raise a ValueError if simplification is unclear.
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