New version: ROOT v0.3.1

[JuliaRegistrator]

• Registering package: ROOT
• Repository: https://github.com/JuliaHEP/ROOT.jl
• Created by: @grasph
• Version: v0.3.1
• Commit: e62cdfab37740a15627c43830099fed29aa9f3ed
• Reviewed by: @grasph
• Reference: Registration in the general registry JuliaHEP/ROOT.jl#22 (comment)
• Description: CERN ROOT compatiblility for Julia
• Release notes:

- Upgraded supported ROOT version to 6.32.02 (latest from Conda, when making this release)
- Support of TObArray
- Add move! function, to disable deletion of a C++ object allocated from Julia
- More convenient Get(::TFile,...) method, that returns an object of the expected with no need of cast anymore.
- Support of file["content_name"] and file.content_name in addition to Get(file, "content_name") to retrieve an object from a TFile
- Fix for compilation of ROOT libraries with clang (used on MacOS)
- Fix support of std::vector. For std::vector SetObject must now be used instead of SetAddress and Branch takes now a reference instead of a pointer.
- Branch() function has now default values for bufsize and splitlevel which becomes optionnal as in the ROOT C++ API.
- Support of TH2x, TProfile, TProfile2D added. The ll ROOT Hist library is now covered.
- Fix Fit function for ARM architecture.

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Contributors to changes with respect to previous release: Philippe Gras and Pere Mato.

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