Cryogenic stuff

git-svn-id: https://gnunet.org/svn/gnunet@31059 140774ce-b5e7-0310-ab8b-a85725594a96
GNUNET_TIME_UNIT_FOREVER_REL added to GNUNET_SCHEDULER_add_write_file call

git-svn-id: https://gnunet.org/svn/gnunet@31060 140774ce-b5e7-0310-ab8b-a85725594a96
- fix procession of channel create in loopback channels


git-svn-id: https://gnunet.org/svn/gnunet@31061 140774ce-b5e7-0310-ab8b-a85725594a96