implementation of mip gap tolerance interval


git-svn-id: https://gnunet.org/svn/gnunet@33269 140774ce-b5e7-0310-ab8b-a85725594a96
PEERSTORE api overhaul


git-svn-id: https://gnunet.org/svn/gnunet@33270 140774ce-b5e7-0310-ab8b-a85725594a96