an improved version of log and conf #3
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conf e log esportano dei tipi che possono essere riutilizzati in altri pacchetti nei casi piu' complessi, e allo stesso tempo mantengono un oggetto di default per i casi piu' semplici, sull'esempio del DefaultServerMux di net/http.
Conf e' una versione molto semplificata di goconf, e non supporta sezioni, ereditarieta', ecc, ma e' sincronizzato con un mutex e puo' essere usato concorrentemente.