[NEW] devel/py-blist: Drop-in list replacement with better performance for large lists

The blist is a drop-in replacement for the Python list that provides better
performance when modifying large lists. The blist package also provides
sortedlist, sortedset, weaksortedlist, weaksortedset, sorteddict, and btuple
types.

WWW: http://stutzbachenterprises.com/blist/

PR: 205914
Submitted by: Brendan Molloy <brendan+freebsd@bbqsrc.net>