Rename to KmerArrays.jl

[AntonOresten]

This package started out representing K-mer counts in vectors of length $N^K$ where $N$ is the alphabet size. In v0.9 I redesigned it to use arrays of size $(N, N, \dots N, N)$ instead, which allowed for some nice abstractions in regards to indexing. These K-dimensional arrays can still natively be linearly indexed in Julia, and they can efficiently be flattened to vectors with vec(ka.values). So, in a sense, it's still "vectorized" -- it's just reshaped, but perhaps KmerArrays.jl would be more descriptive.

[camilogarciabotero]

I am very in favor of this renaming. This is working pretty awesome. I just wanted to add some user-side perspectives about the use:

Currently count_kmers(seq, k) returns the K-dimensional array, so I think it is more intuitive to have this function named kmerarray(seq, k) and then use the actual count_kmers for returning the desired value of the index:

function countkmer(kmerseq::SeqOrView{A}, seq::SeqOrView{A}) where {A} # I prefer omitting the underscore, but that is really idiosyncratic 
    ka = kmerarray(seq, length(kmerseq))
    return ka[kmerseq]
end

This can also be extended to have a set/vector of kmers sub-sequences, or maybe the multiple dispatch will simply allow countkmer.(subseqs::Vector{SeqOrView}, seq::SeqOrView)

Or, I don't know what do you think about overloading the Base.count with that interface...

Best.