Change default accuracy of transforms

[jipolanco]

By default (if m and σ are not explicitly passed), the relative accuracy of the plans is now of the order of $10^{-7}$ instead of $10^{-14}$ for double precision data.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.35%. Comparing base (c1aff72) to head (6f03654).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #38   +/-   ##
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  Coverage   92.35%   92.35%           
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  Files          18       18           
  Lines        1609     1609           
=======================================
  Hits         1486     1486           
  Misses        123      123           

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