Add exact affine pullback operator, fix SimpleTT buffer bug, and add tests#27

shinaoka merged 2 commits intotensor4all:maintensor4all/Tensor4all.jl:mainfrom

NepomukRitz:feature/affine-pullback-operatorNepomukRitz/Tensor4all.jl:feature/affine-pullback-operatorCopy head branch name to clipboard