replace deprecated efel usages

[anilbey]

Updates the efel API usage, removes deprecations.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 53.33333% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 59.33%. Comparing base (bf6294d) to head (e72f7b7).

❗ Current head e72f7b7 differs from pull request most recent head b74aa04. Consider uploading reports for the commit b74aa04 to get more accurate results

Files	Patch %	Lines
bluepyemodel/emodel_pipeline/plotting.py	0.00%	4 Missing ⚠️
bluepyemodel/evaluation/efel_feature_bpem.py	77.77%	2 Missing ⚠️
bluepyemodel/access_point/access_point.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #124   +/-   ##
=======================================
  Coverage   59.33%   59.33%           
=======================================
  Files         106      106           
  Lines        7738     7738           
=======================================
  Hits         4591     4591           
  Misses       3147     3147           

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[ilkilic]

Nice! Thank you!

[AurelienJaquier]

thank you!