Migration to IterativeSolvers, bug fixes, increased coverage#65

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SebastianAment wants to merge 4 commits intoJuliaLinearAlgebra:masterfrom

SebastianAment:iterative-linear-solvers

Commits on Jan 7, 2022

Commits on Jan 17, 2022

reduced accuracy requirement for cg test
SebastianAment
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