Slight performance improvements#36

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make wants to merge 3 commits intolvdmaaten:masterfrom

make:slight-performance-improvements

Commits on Sep 15, 2016

Merge pull request #2 from lvdmaaten/master
make
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Optimized computing of non-edge forces by removing the need to calc sqrt(D) by squaring and inversing theta
Markus Paaso
committed
Slightly improved SPTree constructor performance
Markus Paaso
committed