[#5451] - Incorret type of Colluns in generated cells on ODS document.

When i setup a textField for a type like "Float", "Double", "BigDecimal" or "Number" in a table and generate a ODS document using JRODSExporter" all the elementes in the colunm is generated as String. As a consequence of this behavior, when I press the button ordering (az) with the cursor in this column, the sort made ​​by the OpenOffice / LibreOffice does not work correctly.

Sample:

* Orignal order: 10, 100, 1, 200, 2000, 256
* Order when press buton: 1 , 10, 100, 200, 2000, 256
* Expected order for numbers: 1 , 10, 100, 200, 256, 2000