facading tree functions

[Ipuch]

This change is 

[codeclimate[bot]]

Code Climate has analyzed commit a7116565 and detected 0 issues on this pull request.

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[codecov[bot]]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (f82e587) 82.83% compared to head (a711656) 82.84%. Report is 4 commits behind head on main.

Files	Patch %	Lines
bionc/protocols/biomechanical_model_tree.py	95.23%	2 Missing :warning:
bionc/protocols/biomechanical_model.py	87.50%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #128 +/- ## ========================================== + Coverage 82.83% 82.84% +0.01% ========================================== Files 90 91 +1 Lines 5842 5852 +10 ========================================== + Hits 4839 4848 +9 - Misses 1003 1004 +1 ``` | [Flag](https://app.codecov.io/gh/Ipuch/bioNC/pull/128/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Pierre+Puchaud) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/Ipuch/bioNC/pull/128/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Pierre+Puchaud) | `82.84% <94.23%> (+0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Pierre+Puchaud#carryforward-flags-in-the-pull-request-comment) to find out more.

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