Fixes for magnetic field calculations

[tjjarvinen]

• bug fixes
• visualization update
• units for magnetic fields

[codecov[bot]]

Codecov Report

Merging #113 (8d5b6a1) into master (6cfdb58) will decrease coverage by 0.10%. The diff coverage is 30.00%.

@@            Coverage Diff             @@
##           master     #113      +/-   ##
==========================================
- Coverage   57.17%   57.08%   -0.10%     
==========================================
  Files          15       15              
  Lines        1847     1850       +3     
==========================================
  Hits         1056     1056              
- Misses        791      794       +3     

Impacted Files	Coverage Δ
src/submodules/ToroidalCurrent.jl	0.00% <0.00%> (ø)
src/integrations.jl	63.82% <20.00%> (-1.39%)	:arrow_down:
src/scf.jl	59.03% <100.00%> (ø)

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