Basic-Data Idea

[ccoffrin]

To better support matrix-like analysis of power network data, such as #728.

[codecov]

Codecov Report

Merging #756 (72f0206) into master (ef19e15) will decrease coverage by 0.05%.
The diff coverage is 88.10%.

@@            Coverage Diff             @@
##           master     #756      +/-   ##
==========================================
- Coverage   93.54%   93.48%   -0.06%     
==========================================
  Files          42       43       +1     
  Lines        8780     9031     +251     
==========================================
+ Hits         8213     8443     +230     
- Misses        567      588      +21     

Impacted Files	Coverage Δ
src/PowerModels.jl	50.00% <ø> (ø)
src/core/data_basic.jl	86.47% <86.47%> (ø)
src/core/data.jl	90.92% <90.10%> (+0.63%)	⬆️
src/core/admittance_matrix.jl	93.86% <100.00%> (ø)
src/prob/pf.jl	95.90% <100.00%> (ø)

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