Drop ipynbname

[thangleiter]

ipynbname is slow to find the running notebook. It seems easier to determine if we're in a notebook to check the environment variables.

[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 4 lines in your changes missing coverage. Please review.

Project coverage is 97.97%. Comparing base (37a0453) to head (d118ac1).

Files with missing lines	Patch %	Lines
filter_functions/util.py	63.63%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #101      +/-   ##
==========================================
- Coverage   98.01%   97.97%   -0.05%     
==========================================
  Files           9        9              
  Lines        2270     2272       +2     
  Branches      552      430     -122     
==========================================
+ Hits         2225     2226       +1     
- Misses         18       19       +1     
  Partials       27       27              

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