Added additional doctest and fixed indices

[cmccomb]

Added an additional doctest to evd.rs for a matrix that resulted in failure before these changes. In several locations, changed indices from i as usize + 1 to (i+1) as usize to avoid overflow in type conversion.

Fixes #140.

[codecov-commenter]

Codecov Report

Merging #141 (88713b4) into development (b482acd) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           development     #141      +/-   ##
===============================================
+ Coverage        83.40%   83.44%   +0.03%     
===============================================
  Files               78       78              
  Lines             8377     8377              
===============================================
+ Hits              6987     6990       +3     
+ Misses            1390     1387       -3     

Impacted Files	Coverage Δ
src/algorithm/neighbour/bbd_tree.rs	88.00% <100.00%> (ø)
src/linalg/evd.rs	86.06% <100.00%> (ø)
src/svm/svr.rs	87.27% <100.00%> (ø)
src/tree/decision_tree_classifier.rs	82.60% <100.00%> (ø)
src/tree/decision_tree_regressor.rs	84.54% <100.00%> (ø)
src/optimization/first_order/lbfgs.rs	94.44% <0.00%> (+1.58%)	⬆️
src/optimization/line_search.rs	92.00% <0.00%> (+2.00%)	⬆️

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[cmccomb]

@morenol I feel like I'm playing whackamole and I'm a little confused. Do you see what I'm doing wrong here?

[morenol]

@morenol I feel like I'm playing whackamole and I'm a little confused. Do you see what I'm doing wrong here?

@cmccomb - I re-run the CI and it worked, it looks like there is a flaky test but not from your changes. I need to investigate that a little bit more

[cmccomb]

Thanks @morenol