Splits sauvegarde.conf into two separate configuration files.

client.conf is aim to used on client side (client program).
serveur.conf is aim to be used on server side (serveur program).
This may be less confusing when one will have to configure the
programs.
Only one \ is needed to tell to continue to the next line.
Forgot to change function declaration and doxygen comment.
g_type_init() is deprecated since glib 2.36

This patch does not supress the warning when compiling
with -Wwarning-deprecated.