#6 0.1rc1 Improved.Formula support and wihtout temp directories

[Igor Blanco González]

Customized and improved by Igor Blanco at Binovo IT Human Project
Url: http://www.binovo.es

Customizations:
- saveOds and parseOds now uses Zip clases instead of temporary directory
- now formulas can be added to the cells
- some simple methods to translate to and from zero based column and row numbers
to the right names for the formulas.

[Igor Blanco González]

ods class with formula support and without temporary directories.

[Igor Blanco González]

Use example:

$ods = new ods();
$formula = 'oooc:=SUM([.B2:.B3])';
$ods->addCell(0, $row, $col, $importeTotal, 'float', $formula);