art legacy series 2.13

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This series contains no new art-specific features with respect to the previous series. It was created to support ROOT 6.16.

For the list of specific external product changes, please consult the release notes for 2.13.00.

 Platform/compiler support changes

This series supports C++17 only (the c2 and e17 qualifiers). It also supports the macOS High Sierra and Mojave operating systems in addition to SLF6 and SL7.

 Breaking changes

ROOT 6.16 does not allow explicit template instantiations in classes.h files, required for creating dictionaries. Users should make the following changes:

  #include "MyType.h" 

- template class SomeTemplateWith<MyType>;

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