Budget tests

Add a unit test to check that budget.run(), budget.calc_noise(noise_source), and budget[noise_source].calc_trace() work correctly. Some dev branches are/would fail this test.

A typo in the readme describing how this works was also fixed.

approved this merge request

added 28 commits

• 1e4e1b33...fb790018 - 25 commits from branch gwinc:master
• 890ce2e1 - add unit test to check run, calc_noise, and calc_trace
• e673aa0f - fix typo in readme: "calc() -> calc_trace()"
• df6a16cd - adjustments after refactoring

Compare with previous version

approved this merge request

merged

mentioned in commit b23fc66e