The network property will return an IPv4Network or IPv6Network based on the
nodecon. If the policy has host bits set, the ipaddress module will
simply ignore the host bits, so there may be unexpected results in network
comparisons.
Closes#108
The section number (column header) is -1 when the section is hidden. The
defaultdict use would cause extra columns to be created since the column
count is based on the size of the headers object and -1 would add a new
entry. Change headers to lists.
