strinify crispr object to its id
stringify crispr pair to its id plus the id of the left and right crispr.
Add method to return a bioseq object representing the target sequence of the crispr pair, plus some flanking region
make custom flank length 0 bases
return a slice object instead of a bioseq, its got more useful information
initial commit of utility module that will run crispr escell qc looking at second allele damage for a LIMS2 plate