-indentation and doxygen fixes

git-svn-id: https://gnunet.org/svn/gnunet@33487 140774ce-b5e7-0310-ab8b-a85725594a96
add separate BINDTO options for IPv4 and IPv6

git-svn-id: https://gnunet.org/svn/gnunet@33488 140774ce-b5e7-0310-ab8b-a85725594a96