[WIP] release 0.4

[wvlothuizen]

This PR exists to track changes for the next release

[codecov]

Codecov Report

Attention: 3017 lines in your changes are missing coverage. Please review.

Comparison is base (02aa60c) 43.16% compared to head (2f6eb57) 35.65%.
Report is 840 commits behind head on master.

❗ Current head 2f6eb57 differs from pull request most recent head c4279cb. Consider uploading reports for the commit c4279cb to get more accurate results

Files	Patch %	Lines
pycqed/analysis_v2/disturbancecalc.py	13.75%	533 Missing ⚠️
pycqed/analysis_v2/multi_analysis.py	10.32%	495 Missing ⚠️
pycqed/analysis_v2/Parity_benchmark_analysis.py	9.10%	479 Missing ⚠️
pycqed/analysis_v2/fluxing_analysis.py	5.41%	419 Missing ⚠️
pycqed/analysis_v2/cryoscope_v2_analysis.py	11.48%	239 Missing ⚠️
pycqed/analysis_v2/cryo_scope_analysis_V2.py	13.95%	222 Missing ⚠️
pycqed/analysis_v2/Two_qubit_gate_analysis.py	10.98%	154 Missing ⚠️
pycqed/analysis_v2/cryoscope_v2_tools.py	12.99%	154 Missing ⚠️
pycqed/analysis_v2/full_tomo_tfd.py	0.00%	114 Missing ⚠️
pycqed/analysis_v2/fig_helpers.py	0.00%	52 Missing ⚠️
... and 8 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #673      +/-   ##
==========================================
- Coverage   43.16%   35.65%   -7.52%     
==========================================
  Files         325      301      -24     
  Lines       68745    66196    -2549     
==========================================
- Hits        29677    23601    -6076     
- Misses      39068    42595    +3527     

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