use all available cores in feature extraction

[anilbey]

With this change the Cell object calls the recording.compute_efeatures in parallel in the extract_efeatures function.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 89.06250% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 73.29%. Comparing base (b5fc0e5) to head (0b3eb99).

Files	Patch %	Lines
bluepyefe/cell.py	90.90%	2 Missing ⚠️
bluepyefe/rheobase.py	77.77%	2 Missing ⚠️
tests/test_efel_settings.py	66.66%	2 Missing ⚠️
bluepyefe/extract.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## master #176 +/- ##
==========================================
- Coverage 73.76% 73.29% -0.48% 
==========================================
Files 38 39 +1 Lines 2413 2430 +17 ==========================================
+ Hits 1780 1781 +1 - Misses 633 649 +16 

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[anilbey]

duplicate of another test with the same name

[anilbey]

the other test has more checks

[anilbey]

this code was not getting executed for a long time. The other test was shadowing it

[darshanmandge]

Thanks @anilbey !
I think we should test this with all the readers: ibw, different types of nwb, abf, etc. with a good number of ephys files to see if it works and if it improves the performance. e.g. for ibw files this bluepyemodel example would be a sufficient test.