Re-enable various tests#718

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Commits on Jul 1, 2016

Uncomment tests involving conversion of complex_float32 to bool.
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Uncomment nested struct test.
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Uncomment uint value limits test.
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Uncomment some dimension deduction tests.
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Uncomment some tests checking for proper error handling when
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Uncomment some of the tests for converting option types to and from python
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Uncomment test for broadcasting cast.
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Uncomment part of a test checking proper output for symbolic types.
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Re-enable test involving assigning to a struct.
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Uncomment and add to test for assigning to tuples.
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Uncomment additional test for nd.squeeze.
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Uncommented an old arrfunc test. Renamed test_arrfunc to test_callable.
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Comment out callable test that causes segfaults on Unix systems.
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