flake8 fixes with arguments --max-line-length=80 --ignore=E301,E302
Update source, docs, and tests so bisect(...) is a shortcut for bisect_right(...)
Bug fix: setitem must update _maxes
Change '_maxes is None' to 'not _maxes' in sortedlistwithkey
Add coverage for sub, and, xor, or for sortedset
Add blurb/link to workload perf compare on other perf pages.
Bump version to 0.9.1 for flake8 fixes, bisect fix, setitem fix, _maxes fix, coverage and docs update