-fix leak

git-svn-id: https://gnunet.org/svn/gnunet@31276 140774ce-b5e7-0310-ab8b-a85725594a96
-style and doxygen fixes

git-svn-id: https://gnunet.org/svn/gnunet@31277 140774ce-b5e7-0310-ab8b-a85725594a96
- add underlay api implementation


git-svn-id: https://gnunet.org/svn/gnunet@31278 140774ce-b5e7-0310-ab8b-a85725594a96
- more work on multipart sending
- separated bf-generation and reduction again, as this is now necessary with dynamic bf-lengths

git-svn-id: https://gnunet.org/svn/gnunet@31279 140774ce-b5e7-0310-ab8b-a85725594a96
-avoid duplicate remove

git-svn-id: https://gnunet.org/svn/gnunet@31280 140774ce-b5e7-0310-ab8b-a85725594a96