WIP: do some matrix factorizations/inverses in-place

[chriscoey]

No description provided.

[codecov]

Codecov Report

Merging #705 (88e48f3) into master (757b1db) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #705      +/-   ##
==========================================
+ Coverage   97.22%   97.24%   +0.01%     
==========================================
  Files          53       53              
  Lines        7936     7953      +17     
==========================================
+ Hits         7716     7734      +18     
+ Misses        220      219       -1     

Impacted Files	Coverage Δ
src/Cones/Cones.jl	98.30% <ø> (ø)
src/Hypatia.jl	100.00% <ø> (ø)
src/Cones/doublynonnegativetri.jl	99.01% <100.00%> (+<0.01%)	⬆️
src/Cones/epinormspectral.jl	98.80% <100.00%> (+<0.01%)	⬆️
src/Cones/epipersepspectral/matrixcsqr.jl	100.00% <100.00%> (ø)
src/Cones/epitrrelentropytri.jl	100.00% <100.00%> (ø)
src/Cones/hypoperlogdettri.jl	99.19% <100.00%> (ø)
src/Cones/hyporootdettri.jl	98.98% <100.00%> (ø)
src/Cones/matrixepipersquare.jl	99.18% <100.00%> (+<0.01%)	⬆️
src/Cones/possemideftri.jl	100.00% <100.00%> (ø)
... and 4 more

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