Bug 148392 Float type fails to be retrieven in scripted datasets
1/ Create a scripted dataset with Float type values, retrive them in the fetch dataset's method configure the output columns and assign them the Float type => result preview fails to show the float columns values 2/ Set the columns' type as Any => the result preview shows normally 3/ Create a chart based on the previous dataset configure the databindings setting float as the said columns type (the dataset's type is Any) => the series fails to appear in the graph (see error in footer) 4/ Change the data bindings for the said columns as Any and use the series fromatting to fix it => the series appears normally
core/org.eclipse.birt.core/src/org/eclipse/birt/core/data/DataTypeUtil.java
* Converts an ODA data type code to its 
     * corresponding Data Engine API data type constant
     * defined in DataType.
     * @param odaDataTypeCode   an ODA data type code
     * @throws BirtException if the specified ODA data type code
     *                      is not a supported type
     */
    public static int toApiDataType( int odaDataTypeCode )
        throws BirtException
    {
        Class odiTypeClass = toOdiTypeClass( odaDataTypeCode );
        return toApiDataType( odiTypeClass );
    }
	
	/**
	 * Convert object to a suitable type from its value 
	 * Object -> Integer -> Double -> BigDecimal -> Date -> String
	 */
	public static Object toAutoValue( Object evaValue )
	{
		if ( evaValue == null )
			return null;
		Object value = null;
		if ( evaValue instanceof String )
		{
			
			String stringValue = (String) evaValue;
			value = toIntegerValue( evaValue );
			if ( value == null )
			{