Compiling tests under Visual Studio 2019 14.29.30133 (19.29.30145.0) fails with a not very helpful error:
```
libs\histogram\test\algorithm_project_test.cpp(186,1): fatal error C1903: unable to recover from previous error(s); stopping compilation
```
This can be fixed by moving the dynamic-only tests into a separate function, so that they are only compiled and run once.
---------
Co-authored-by: Hans Dembinski <hans.dembinski@gmail.com>
* Added fraction accumulator
* Added binomial proportion interval computers: Wald, Wilson Score, Clopper Pearson, Jeffreys
* Width of intervals for all classes can be set via deviation or confidence_level
* Support valarray in histogram::fill
* Add fraction and count to user guide
Co-authored-by: Hans Dembinski <hans.dembinski@gmail.com>
Co-authored-by: Hans Dembinski <HDembinski@users.noreply.github.com>
* 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
