* rename link test to odr test and check odr test completeness
* added convenience header for algorithm
* added minimal docs for axis.hpp, accumulators.hpp, algorithm.hpp
* temporarily remove display.hpp (will return in another patch)
* introduce offset for faster linearization of non-growing axes
* added traits::is_inclusive and constexpr bool inclusive() methods for builtin axes
* bug fixes for fill method when weight array is used with non-inclusive axis and when growing axes are used
* bug fix of axis::options::test(...)
* coverage tested with gcc-8, updated CONTRIBUTING.md with coverage info
* new tests of nothrow move assignment for builtin axis types
* switch to xenial, which apparently comes with a different glibc version that adds a nothrow move assignment operator for std::string
* provide unsafe access to buffer
* factored mp_int out into separate header and renamed to large_int
* refined adding behavior
* more warnings and comeback of coverage variant
* better coverage reporting
* better operators for mp_int, unlimited_storage::reference, map_impl::reference, copying code from boost.operators
* treat warnings as errors on travis
* make appveyor build feature branches
* fixes broken msvc build
* smaller xml files for testing serialization
* fixing many warnings on msvc
* bug-fixes to mp_int regarding operators and new tests to check their behavior
* don't expect iterable histogram::at to have size method
* build benchmarks in release mode
* test everything by default when b2 is run on project directory
* more test coverage
* Travis uses b2 and codecov now
* replacing boost::multiprecision with custom implementation to avoid the dependency
* improved axis implementation: `update` is now a normal method
* introduced use_default tag type to set defaults
* whitespace fixes and doc update
Add missing copyright header to CMakeLists.txt.
Rename build directory to tools.
Update Travis CI and AppVeyor scripts.
Ignore variants of build directory.
Ignore CMakeSettings.json used with CMake integration for VS2017.
Ignore Visual Studio and Visual Studio Code local settings folder.
