Previous code used random_device which would occasionally generate test sets with higher than expected error rates, this way we have something consistent to CI test against.
* Disable one concept check for gcc 6.2 which generates an internal compiler error.
* Increase expected error rate on one barycentric test - it was too tight to test on some platforms.
* Fix some __float128 miss-configurations.
Fix some msvc failures.
Suppress some compiler warnings.
Added iterator based constructor.
Moved docs to better position.
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