Fix duplication of column names in linking_trackpy

[w-k-jones]

Fix for #216

Workaround for a trackpy bug was causing issues if the features dataframe already had x, y columns due to coords in the input data. This quick fix simply renames any columns with those names first to temporary names

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[codecov]

Codecov Report

Base: 39.22% // Head: 39.30% // Increases project coverage by +0.08% 🎉

Coverage data is based on head (384a201) compared to base (49c4c27).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           hotfix     #217      +/-   ##
==========================================
+ Coverage   39.22%   39.30%   +0.08%     
==========================================
  Files          11       11              
  Lines        2246     2249       +3     
==========================================
+ Hits          881      884       +3     
  Misses       1365     1365              

Flag	Coverage Δ
unittests	39.30% <100.00%> (+0.08%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
tobac/tracking.py	66.07% <100.00%> (+0.93%)	⬆️

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[w-k-jones]

Also fixed some the notebook issues raised in #215 while testing this, I can also go through and make the other notebook fixes if others think this is worthwhile to do now

[freemansw1]

Thanks for the quick fix, @w-k-jones. I'm happy with this!