Pretty sure a direct map here is quicker

Fix warning

Add IntMatrix

Harmonise COPYING files

Add README.md and COPYING

Add conversions to and from polymorphic vectors, and a conversion from the monomorphic vector type with unknown length (can be handy in the case where the caller doesn't actually have the structure to hand).

And foldli/foldri and failOnInfinities

Add increment

Rename ...AsVector etc functions so as to use short suffixes V, VS, VSV (vector, vector-slice, vector of vector-slices). The longer versions had potential for confusion with matrix slices, took up a lot of space, and were not actually very clear despite being longer

Use renamed structure

Adapt order

Add foldli, foldri

Merge from branch flat-everything. This switches to using complex and flat-vector implementations from a separate repo, and using flat-vector complex vector as internal storage for the complex matrix.

These bits of names are redundant

Pull out complex and complex vector into separate repo

Slightly quicker vector-slice-to-vector

We could in theory use the flat vectors throughout, rendering irrelevant all the work I did to allow matrices to separate their internal and external structures

OK, so we need separate rep2 and rep3 versions of everything. Hm

And experiment with using the flat vector for plain complex vector everywhere (I think this is not going to go well...)

Try a generic flat vector type