Bcdaniels sensitivity update

[hbsmith]

• fixes the conflicts from #89
• fixes associated tests so that they hopefully pass
• changes xs to ys in the threshold functions for WTNetworks
• updates the WTNetwork neighbor functions, so that the index being queried is always included as its own neighbor, unless theta is explicitly positive_threshold or negative_threshold. This is a temporary fix, which will be depreciated with #84. That issue will convert WTNetwork to LogicNetwork by default, and that way use LogicNetwork.neighbor methods instead of having its own methods. This will resolve the problem of having to assume the theta function contains self-loops.

[codecov-io]

Codecov Report

Merging #113 into dev will increase coverage by <.01%. The diff coverage is 80%.

@@            Coverage Diff             @@
##              dev     #113      +/-   ##
==========================================
+ Coverage   97.18%   97.19%   +<.01%     
==========================================
  Files          33       33              
  Lines        3836     3920      +84     
==========================================
+ Hits         3728     3810      +82     
- Misses        108      110       +2

Impacted Files	Coverage Δ
neet/boolean/logicnetwork.py	90.82% <ø> (ø)	:arrow_up:
test/test_boolean.py	100% <100%> (ø)	:arrow_up:
neet/sensitivity.py	96.93% <100%> (-0.07%)	:arrow_down:
test/test_interfaces.py	91.39% <100%> (ø)	:arrow_up:
neet/boolean/wtnetwork.py	97.33% <50%> (-1.3%)	:arrow_down:
test/test_randomnet.py	100% <0%> (ø)	:arrow_up:
neet/boolean/randomnet.py	79.53% <0%> (+11.35%)	:arrow_up:

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