[bug-GNUnet] Can't specify different names for config file in project data

[Alessio Vanni]

The GNUNET_OS_ProjectData struct contains two fields, `config_file' and
`user_config_file'.  By default they are set to "gnunet.conf" and
"~/.config/gnunet.conf".

When these fields are set to a different name, the application refuses
to start.  It seems the problem is caused by the fact that the
application is unable to find the required informations to connect with
GNUnet, i.e. the specified file must be a copy of gnunet.conf instead of
containing only the application-specific configuration for the
application to work.

A.V.