Replace IQR with overlap coefficient (OVL)

[RyloByte]

In the abundance recruiting module, it may be that the inter-quartile range that is used to recruit reads is not well suited for variable length contigs at the short range. Instead perhaps try implementing the OVL-based similarity measure, similary to what is used in MetaBAT. The code is written, just needs to be popped in and tested against the IQR method. Use runtime and error metrics to determine which methods performs best for this step.