Improves the SVD by following what is done in Matlab. This is part of the changes of MR1777.
Description
Defines the pseudo-inverse tolerance according to what is typically done. For example, see Matlab or Armadillo libraries.
This is part of the changes of MR !1777 (merged).
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.
Edited by Alex Buccheri