Support Jagged branch from CMS NanoAOD

[Moelf]

• handle multiple blocks in datastream
• hard code TLeafB

[codecov]

Codecov Report

Merging #22 (56a13e9) into master (67f1e36) will increase coverage by 2.78%.
The diff coverage is 92.06%.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
+ Coverage   78.09%   80.88%   +2.78%     
==========================================
  Files           7        8       +1     
  Lines         904      926      +22     
==========================================
+ Hits          706      749      +43     
+ Misses        198      177      -21     

Impacted Files	Coverage Δ
src/custom.jl	0.00% <0.00%> (ø)
src/bootstrap.jl	79.40% <91.66%> (+8.81%)	⬆️
src/root.jl	79.37% <92.85%> (+0.02%)	⬆️
src/UnROOT.jl	100.00% <100.00%> (ø)
src/io.jl	89.39% <100.00%> (+2.82%)	⬆️
src/streamers.jl	86.79% <100.00%> (+0.13%)	⬆️
src/types.jl	93.50% <100.00%> (+0.08%)	⬆️

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[Moelf]

julia> using UnROOT

julia> array(ROOTFile("./test/samples/tree_with_jagged_array.root"), "t1/int32_array")
100-element Vector{Vector{Int32}}:
 []
 [0]
 [0, 1]
 [0, 1, 2]

[Moelf]

@tamasgal I'm gonna squash merge this since tests and converge both seem happy. I'd propose drop 1.0 support since next LTS (1.6 or 1.7) is right around the corner. Let me know what you think

[tamasgal]

Very nice work!

I'd suggest to add hasproperty since this seems to be the only requirement we need and it's a one-liner: https://github.com/JuliaLang/julia/blob/6aaedecc447e3d8226d5027fb13d0c3cbfbfea2a/base/reflection.jl#L1583-L1590

Something like below right into UnROOT.jl or in a separate file compat.jl:

if VERSION < v"1.2"
    hasproperty(x, s::Symbol) = s in fieldnames(typeof(x))
end