Feature/test fixes

[StokesMIDE]

A couple of fixes related to the unit tests.

• Removes references to "hanning" filter, which was removed/renamed in SciPy 1.9.x
• Modifies paths for loading test files to be relative to the test Python file loading it. Previous paths worked in the GitHub Actions, but did not work locally.

Bonus fix: the Scipy URLs in various endaq.calc.fft corrected.

Note that as of the time of this PR's opening, the Windows tests run from the GitHub Action are inconsistently hanging and timing out for some reason. This does not seem connected to any changes on our end, or to libraries we use. It may be a temporary issue with GitHub's Windows environments. One timeout occurred while trying to install Python requirements, before the tests themselves even started.

Bonus feature: A timeout parameter has been added to endaq.ide.files.get_doc(). It was hoped that this would prevent the tests from stalling, but seems to have had no effect. It's a good thing to have in any case, however.

[codecov-commenter]

Codecov Report

Merging #210 (bbee830) into development (5f446dd) will decrease coverage by 0.15%. The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           development     #210      +/-   ##
===============================================
- Coverage        70.59%   70.44%   -0.16%     
===============================================
  Files               34       32       -2     
  Lines             3095     3086       -9     
===============================================
- Hits              2185     2174      -11     
- Misses             910      912       +2     

Impacted Files	Coverage Δ
endaq/batch/core.py	94.80% <ø> (ø)
endaq/calc/fft.py	72.14% <ø> (ø)
endaq/ide/files.py	76.57% <100.00%> (ø)
endaq/ide/gdrive.py	80.00% <100.00%> (ø)
endaq/plot/plots.py	66.88% <0.00%> (-0.67%)	:arrow_down:
endaq/ide/__init__.py
endaq/__init__.py

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