rel #22644 : remove unused configuration items

config.ini.default

 [global]
-sgbd.adapter = mysqli
-superuser.user = admin
-superuser.pwd = admin
-console.user = console
-console.pwd = console
 timeZone = Europe/Paris
-langue = fr_FR
-mail.transport.smtp.host = 
+
+; SMTP
+; mail.transport.smtp.host =
+
+; Used by global http client
 proxy.host = 
 proxy.port = 
 proxy.user = 
-proxy.pass = 
+proxy.pass =
+
+; SGBD
+sgbd.adapter = mysqli
 sgbd.config.host = localhost
 sgbd.config.port = 3306
 sgbd.config.username =
 sgbd.config.password = 
-sgbd.config.dbname = 
-key_google = 
-id_amazon = 
-debug.level = 0
-debug.debug = no
-debug.ip =
-debug.port =
-debug.file =
-caching = 1
+sgbd.config.dbname =
+
+; Advanced
 amber.deploy = 0
 experimental_dev = true