option to include non-canonical k-mers

[haneubau]

Hi, I was wondering if it is possible to include an argument in kmer-db that allows the inclusion of non-canonical k-mers in the construction and querying of databases. Thus far I have been using a modified version that only uses non-canonical k-mers by simply changing this line: https://github.com/refresh-bio/kmer-db/blob/04f2dd420ea1bb3de263e4753f4cbc154e32b925/src/kmer_extract.h#L87 to kmer_can = kmer_str; Also, thanks for creating kmer-db, it's been quite useful!

best, Hannes