[trac641] Random number generator now throws exceptions on error
Previously when compiled without NDEBUG set it did, if a check failed it called assert(). The tests checks for this using ASSERT_DEATH. However, ASSERT_DEATH leaks memory and this was obscuring the valgrind output. The changes here cause an exception to be thrown (instead of a call to abort()) in the case of an error and the unit tests now EXPECT_THROW instead of ASSERT_DEATH.
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