Add new documentation section for integrators.
Remove isfinite from std_real_concept.hpp - it's not part of our conceptual requirements.
Add workarounds for older compilers that can't handle the default arguments to the function.
Restrict testing test_trapezoidal.cpp to compilers that handle lambdas.
Make the concept checks C++03.
Make test_trapezoidal.cpp compile with VC11's broken lambda support.
Only invoke numeric_limits<>::max_digits10 for decimal multiprecision types.
Also make sure our traits classes are instantiated on the actual number type, not an expression template.
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 testing the old mingw32 - it's too broken.
* Add feature dependency checks for new C++11 tests.
* Disable some tests that generate too large object files.
* 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 bjam command line in appveyor file.
* Fix assertions triggered in bessel_i0.hpp.
* Remove common factor testing - it's moved to integer.
* Add lots of additional {} in initializers to silence clang warnings.
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Fix some msvc failures.
Suppress some compiler warnings.
Added iterator based constructor.
Moved docs to better position.
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