MdagM solver from mg_proto#56

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sunwayihep wants to merge 7 commits intoJeffersonLab:develfrom

sunwayihep:mgproto-mdagm

Commits on Mar 14, 2019

fixed a bug of XML parsing
sunwayihep
committed

Commits on Sep 30, 2019

Commits on Oct 3, 2019

recreate multigrid subspace if number of iterations exceed some threshold count
sunwayihep
committed

Commits on Oct 4, 2019

check convergence after each step of two-step solver
sunwayihep
committed

Commits on Nov 14, 2019

fix a bug to avoid recreate the subspace at X solve where the same subspace already generated at first Y solve
sunwayihep
committed

Commits on Nov 25, 2019

add RsdToleranceFactor for linop
sunwayihep
committed