chg: dev: work for gh-220
chg: dev: tidy
chg: dev: improving support for parallel edges gh-211
Chg: dev: more work for gh-201
Chg: dev: API improvements for gh-204
Chg: dev: initial work to support sub-interfaces for gh-218
chg: dev: tidy
chg: dev: tidy
chg: dev: work on new simpler ipv4 for gh-219
chg: dev: continue work for ank utils with parallel edges for gh-220