Example 7 proposition

[ejayromero]

Proposition to add some examples of protocols, which are mainly based on some Bluecellulab's examples and functions.
The example contains:

1. Negative and rheobase step current
2. Multiple negative step current
3. IV-curve resulting from previous example.
4. Multiple positive step current
5. FI-curve resulting from previous example
6. Voltage sag vs distance from soma on multiple dendrites positions
7. A modified EPSP which compared Psp ratio vs distance to soma on multiple dendrites positions

All examples have the detailed code and plot for analysis.

[AurelienJaquier]

Thanks for the PR!
Could you add your example to the table in examples/README.rst?

[AurelienJaquier]

Looks good! Thanks @ejayromero

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.24%. Comparing base (47d1931) to head (a1f61d9).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #194      +/-   ##
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- Coverage   91.24%   91.24%   -0.01%     
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  Files          95       95              
  Lines        5691     5708      +17     
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+ Hits         5193     5208      +15     
- Misses        498      500       +2     

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[darshanmandge]

Thanks for your contribution @ejayromero!