Support pinv in Woodbury and SymWoodbury
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When building a `Woodbury` or `SymWoodbury` matrix, we precompute
(C⁻¹ + V * (A\U))⁻¹
However, if the final `W` is rank-deficient, this inverse does not
exist. To handle this case, we now support an optional keyword argument
`use_pinv::Bool=false` to use the pseudo-inverse instead.
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When building a
WoodburyorSymWoodburymatrix, we precomputeHowever, if the final
Wis rank-deficient, this inverse does notexist. To handle this case, we now support an optional keyword argument
use_pinv::Bool=falseto use the pseudo-inverse instead.