Enforce DOT as decimal separator for Oracle. MDL-11629 ; backported from HEAD

lib/dmllib.php

@@ -2048,6 +2048,10 @@ function configure_dbconnection() {
         /// NOTE: Not 100% useful because GPC has been addslashed with the setting off
         ///       so IT'S MANDATORY TO ENABLE THIS UNDER php.ini or .htaccess for this DB
         ///       or to turn off magic_quotes to allow Moodle to do it properly
+        /// Now set the decimal separator to DOT, Moodle & PHP will always send floats to
+        /// DB using DOTS. Manually introduced floats (if using other characters) must be
+        /// converted back to DOTs (like gradebook does)
+            $db->Execute("ALTER SESSION SET NLS_NUMERIC_CHARACTERS='.,'");
             break;
     }
 /// Finally define dbfamily