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There are TWO new variables that will provide history generation:
$HISTORY default is "true"
 +Here we will define if generator must create a history of indexes from
  generated websites (for each file in $TYPEDIR)

$HISTORYFILEFORMAT default is "%Y%m%d%H%M"
 +History file will be index.html.$(date +"$HISTORYFILEFORMAT")

wwwsdi.conf was updated to provide an example to these brand new variables
Signed-off-by: Bruno Ribas <ribas@c3sl.ufpr.br>