Jutho / LinearMaps.jl / 470

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add Kronecker products for LinearMaps (#61)

* add Kronecker products for LinearMaps

* announce feature in README

* add promotion of matrices, tests

* add comments, use mixed-product trick

* export UniformScalingMaps, add scalar mul, tests

* simplify scalar multiplication of composites

* adopt to new test suite

* prepare for require_one_based_indexing

* revert export of UnifformScalingMap, add LinearMap constructor instead

* update docstring

* add docstring to kron

* add KroneckerSumMap, yet untested

* add KroneckerPowerMap, yet untested

* KroneckerMap with many maps, optimize mul, more tests

* add dim-checker helper, resolve type instability, tests

* add conversion rules

* optimize MatrixMap and scaling multiplication, enable KroneckerSum tests

* fix matrix map handling across different julia versions

* minor fixes, improve coverage

* improve coverage, minor fixes

* improve coverage further

* remove false type-instability comment, uniform scaling comparison

* require one-based indexing, move kronecker power, simplify size

* clean up Kronecker (sum) powers

* make kron(sum)powers inferrable

* remove obsolete specifiers

* rename promote_to_lmaps -> convert_to_lmaps to avoid conflict with BlockMaps

* move conversion and check_dim to Main, pepper with at-propagate_inbounds

* make at-inbounds work properly, add some conversion rules

* simplify kronsum constructor

* edits as per review, update docstrings

* use memory requirement heuristic for branching

150 of 150 new or added lines in 6 files covered. (100.0%)

3500 of 3764 relevant lines covered (92.99%)

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