Nicolas Tancogne-Dejean requested to merge tolerance_qmr into develop Mar 26, 2021

Description

Changes the tolerance in the solver to be M_TINY as these checks are just done for avoiding divisions by zero.

News snippet

Minor improvement of the QMR solver.

Checklist

I have checked that my code follows the Octopus coding standards
I have added tests for all the new features added in this request.