internal/bigvector: use interface to allocations for basis vectors

[mmcloughlin]

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[codecov-commenter]

Codecov Report

Merging #106 (355b714) into master (5bb4870) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #106   +/-   ##
=======================================
  Coverage   70.00%   70.00%           
=======================================
  Files          30       30           
  Lines        1207     1207           
=======================================
  Hits          845      845           
  Misses        302      302           
  Partials       60       60           

Flag	Coverage Δ
unittests	70.00% <ø> (ø)

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Impacted Files	Coverage Δ
alg/dict/dict.go	94.28% <ø> (ø)

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