Update gp_bases.py

[churchilgw4]

Adding functionality to provide reference observing frequency for generic chromatic noise block

[vhaasteren]

Looks good to me, but should be merged to dev, not master

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.66%. Comparing base (90dfa56) to head (f151158).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #441      +/-   ##
==========================================
+ Coverage   71.58%   71.66%   +0.07%     
==========================================
  Files          13       13              
  Lines        3245     3240       -5     
==========================================
- Hits         2323     2322       -1     
+ Misses        922      918       -4     

Files with missing lines	Coverage Δ
enterprise/signals/gp_bases.py	70.51% <100.00%> (ø)

... and 3 files with indirect coverage changes

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[churchilgw4]

Closing PR due to test issues for macOS and Ubuntu