fix the output table

[zktuong]

So now the output table in return_tables=True gives the same layout as per the plot, particularly for symmetrical=False situation. Also rearranged the construction of the interaction_count output to be consistent with the options.

Also updated readme to give an indication for how to save the figures.

closes #22

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Codecov Report

Merging #25 (add8930) into master (dfb2f1b) will decrease coverage by 0.54%. The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master      #25      +/-   ##
==========================================
- Coverage   99.82%   99.28%   -0.54%     
==========================================
  Files           7        7              
  Lines         558      560       +2     
==========================================
- Hits          557      556       -1     
- Misses          1        4       +3     

Flag	Coverage Δ
unittests	99.28% <33.33%> (-0.54%)	:arrow_down:

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Impacted Files	Coverage Δ
ktplotspy/plot/plot_cpdb_heatmap.py	91.66% <33.33%> (-6.16%)	:arrow_down: