ES-66 Feature/shock threshold

[CFlaniganMide]

Really basic shock thresholding function to generate shorter clips of files for further analysis.

Should close #169 with a minimal solution.

[codecov-commenter]

Codecov Report

Merging #178 (8b1422b) into development (40a40c5) will decrease coverage by 0.15%. The diff coverage is 12.50%.

@@               Coverage Diff               @@
##           development     #178      +/-   ##
===============================================
- Coverage        61.72%   61.57%   -0.16%     
===============================================
  Files               34       34              
  Lines             2613     2621       +8     
===============================================
+ Hits              1613     1614       +1     
- Misses            1000     1007       +7     

Impacted Files	Coverage Δ
endaq/calc/shock.py	83.10% <12.50%> (-4.04%)	:arrow_down:

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[S-Hanly]

Couple comments @CFlaniganMide

• Can you add some comments to explain the function and input/outputs
• You'll need to use the calc.util.sample_spacing function to determine the sample rate and be able to deal with index types of datetime, seconds, timedeltas (an error is generated for anything other than seconds)
• I'm getting an empty list when I try it?

https://colab.research.google.com/drive/1avKj__HojMguc215t8pX2lBgsPc4Q0AV?usp=sharing

A more big picture comment is that I am expecting to get these returned time segments in a way that will allow me to select the "best" ones within them. So for example I expected it to be ordered by peak value with those peak values visible so I can generate a histogram of the peaks

[S-Hanly]

I think we can close this now that Connor isn't here and #190 is about to be merged in which provides this functionality