Commits on Oct 9, 2017

1. Optimize squareform's square matrix construction …

   Avoid breaking chunks into smaller pieces than necessary by taking
   advantage of symmetry. Namely note that pieces of rows also correspond
   to pieces of columns as well.  Starting from the right corner where
   these pieces are simple singleton 1-D arrays, concatenate them together
   into larger pieces. Use a 2-D singleton zero array as a seed for this
   concatenation to grow from. By doing this, we avoid further subselection
   from the 1-D array beyond the necessary selection of pieces.

   

   jakirkham committed Oct 9, 2017
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