Use maintained igor2 instead of unmaintained igor

[AurelienJaquier]

No description provided.

[codecov-commenter]

Codecov Report

Merging #128 (529ae3f) into master (431fd34) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #128   +/-   ##
=======================================
  Coverage   65.25%   65.25%           
=======================================
  Files          31       31           
  Lines        2058     2058           
=======================================
  Hits         1343     1343           
  Misses        715      715           

Impacted Files	Coverage Δ
bluepyefe/igorpy/__init__.py	91.48% <100.00%> (ø)

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[AurelienJaquier]

There is a fork of igor that is maintained and includes our changes: AFM-analysis/igor2#4
However, it has a hard requirement for python 3.8. Is it ok if we start using it and also require python 3.8 for BluePyEfe @wvangeit ? Latest numpy also use at least py38 and py37 will reach end of life in June.