Use n_ prefix consistently, (rename all num_ to n_), fixes #986

[maxnoe]

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Codecov Report

Merging #2046 (cb3fa33) into master (8c42f54) will decrease coverage by 0.00%.
The diff coverage is 91.89%.

@@            Coverage Diff             @@
##           master    #2046      +/-   ##
==========================================
- Coverage   92.42%   92.42%   -0.01%     
==========================================
  Files         197      197              
  Lines       16034    16030       -4     
==========================================
- Hits        14820    14816       -4     
  Misses       1214     1214              

Impacted Files	Coverage Δ
ctapipe/instrument/tests/test_optics.py	100.00% <ø> (ø)
ctapipe/io/simteleventsource.py	96.62% <ø> (ø)
ctapipe/io/eventseeker.py	78.94% <25.00%> (ø)
ctapipe/core/provenance.py	94.02% <66.66%> (ø)
ctapipe/instrument/subarray.py	88.97% <75.00%> (ø)
ctapipe/instrument/guess.py	95.74% <80.00%> (ø)
ctapipe/calib/camera/pedestals.py	95.95% <88.88%> (ø)
ctapipe/calib/camera/flatfield.py	96.03% <90.00%> (ø)
ctapipe/image/muon/intensity_fitter.py	88.65% <92.85%> (ø)
ctapipe/calib/camera/tests/test_flatfield.py	93.02% <100.00%> (ø)
... and 19 more

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