Fix plotting

[carrascomj]

Closes #271

Description

Escher deprecated the display_on_notebook and display_in_browser functions in favor of using widgets.

Implementation

• Updated all escher outputs; the methods display_on_notebook and display_in_browser has been replaced by display(builder) and builder.save_html(), respectively (as explained in the docstrings of the deprecated functions).
• Added documentation about jupyter widgets on the installation section (also for plotly).
• Fixed one plotting function on DIfferentialFVA.

[codecov[bot]]

Codecov Report

Merging #272 (eafe425) into devel (879e756) will decrease coverage by 0.33%. The diff coverage is 0.00%.

:exclamation: Current head eafe425 differs from pull request most recent head cdffdb3. Consider uploading reports for the commit cdffdb3 to get more accurate results

@@            Coverage Diff             @@
##            devel     #272      +/-   ##
==========================================
- Coverage   64.41%   64.07%   -0.34%     
==========================================
  Files          58       58              
  Lines        5572     5576       +4     
  Branches      948      949       +1     
==========================================
- Hits         3589     3573      -16     
- Misses       1780     1799      +19     
- Partials      203      204       +1     

Impacted Files	Coverage Δ
cameo/flux_analysis/simulation.py	68.81% <ø> (ø)
...ain_design/deterministic/flux_variability_based.py	63.77% <0.00%> (-0.55%)	:arrow_down:
cameo/models/webmodels.py	56.81% <0.00%> (-12.13%)	:arrow_down:

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