Adding an option to fit BIDS-study layout (updated)

[djarecka]

instead of #361 (after rewriting history went wrong); I included the newest changes to main.
From the previous description:

• allowing for configuring analysis_path
• ading rias to .babs and gitignore
• adding initial configuration file to .babs, so it can be read whenever is neeeded

An example presenting the usage and the layout can be found on the
babs_demo repo, follow the section for the bids_layout

[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.87879% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.62%. Comparing base (7b7e33f) to head (3535cd8).

Files with missing lines	Patch %	Lines
babs/bootstrap.py	71.42%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #369      +/-   ##
==========================================
+ Coverage   79.58%   79.62%   +0.04%     
==========================================
  Files          17       17              
  Lines        1959     1983      +24     
  Branches      332      336       +4     
==========================================
+ Hits         1559     1579      +20     
- Misses        279      281       +2     
- Partials      121      123       +2     

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