core/kmeraffect.{h,cpp}: remove KmerStringAffect
KmerStringAffect is no more used in the code. If one day we would like to "store more things" in the affectations, we could still extend KmerAffect with a pointer to something else.
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KmerStringAffect is no more used in the code. If one day we would like to "store more things" in the affectations, we could still extend KmerAffect with a pointer to something else.