Mulliken.py, removed redundant functionalities for plot data, added f…

[AkashHiregange]

…urther documentation and comments to describe the functionality to make life easier. Removed the deprecated matplotlib funcitonality Axes from graphs.py

• Added further documentation and comments to the mulliken.py file
• Removed redundant functionality and changed a few variable names to make life easier
• Removed the deprecated matplotlib import Axes from graph.py and added the latest import line. (This was necessary for the tests to pass)
• All the tests for mulliken analyse works

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.15%. Comparing base (6daf5ba) to head (e4e7245).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #155      +/-   ##
==========================================
- Coverage   88.23%   88.15%   -0.09%     
==========================================
  Files          80       80              
  Lines        3265     3241      -24     
==========================================
- Hits         2881     2857      -24     
  Misses        384      384              

Flag	Coverage Δ
unittests	88.15% <100.00%> (-0.09%)	⬇️

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