Converts the edges of the infection tree described in the
transmat
object into a network
object, copying in appropriate edge attributes for 'at',
'infDur', 'transProb', 'actRate', and 'finalProb' and
constructing a vertex attribute for 'at'.
# S3 method for transmat
as.network(x, ...)
an object of class transmat
to be converted into a network
object
unused