return error as exit code


git-svn-id: https://gnunet.org/svn/gnunet@30960 140774ce-b5e7-0310-ab8b-a85725594a96
- detect GNUnet installation
- detect if GNUnet is running


git-svn-id: https://gnunet.org/svn/gnunet@30961 140774ce-b5e7-0310-ab8b-a85725594a96
path required


git-svn-id: https://gnunet.org/svn/gnunet@30962 140774ce-b5e7-0310-ab8b-a85725594a96
-doxygen fixes, fix starting gnunet-service-resolver as it is no longer in /opt/jdk1.6.0_22/bin/:/home/grothoff/bin/:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games:.

git-svn-id: https://gnunet.org/svn/gnunet@30963 140774ce-b5e7-0310-ab8b-a85725594a96