Code style Update

[sadrasabouri]

What does this implement/fix? Explain your changes.

This PR is a trial for enhancing the repositories' code style. Below is provided some overall changes:

• Unifying code style in documentation, code, and tests
• __class_stat_init__ function in pycm_handler.py modified
• __overall_stat_init__ function in pycm_handler.py
• ConfusionMatrix.__init__ method
• extra checks in pycm_interpret.py
• save_obj modified

Note: This might look like a huge PR, but reviewing it will take no time since it's all style-related.

[codecov-commenter]

Codecov Report

Merging #486 (9730334) into dev (b1bcd64) will decrease coverage by 0.03%. The diff coverage is 100.00%.

:mega: This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

@@            Coverage Diff             @@
##              dev     #486      +/-   ##
==========================================
- Coverage   99.33%   99.30%   -0.03%     
==========================================
  Files          13       13              
  Lines        3105     2970     -135     
  Branches      447      439       -8     
==========================================
- Hits         3084     2949     -135     
  Misses          8        8              
  Partials       13       13              

Impacted Files	Coverage Δ
pycm/pycm_compare.py	100.00% <ø> (ø)
pycm/pycm_curve.py	97.03% <ø> (ø)
pycm/pycm_interpret.py	98.71% <ø> (-0.10%)	:arrow_down:
pycm/pycm_overall_func.py	100.00% <ø> (ø)
pycm/pycm_class_func.py	100.00% <100.00%> (ø)
pycm/pycm_handler.py	100.00% <100.00%> (ø)
pycm/pycm_obj.py	98.86% <100.00%> (-0.02%)	:arrow_down:
pycm/pycm_param.py	100.00% <100.00%> (ø)
pycm/pycm_util.py	99.69% <100.00%> (+0.01%)	:arrow_up:

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