add ability to add nodes at overlay creation
use new add overlay format
tidy, toggle out publishing v6 topology
new simplified example
tidy logic
add examples
tidy simple example
add build option
add retain to adding nodes through add_overlay
tidy simple
set False for yEd exported booleans (by default not present on a node)
more examples
more example
simple example
processing for nren 1400
add ip
tidying
handle multi-as from zoo
set default for blank labels, better handling of non-unique labels: if so then set with asn
tidy manifest