PDI-6637 Open Office calc ods files wrongly imported (Columns limited to 10 and NPE)

<h1>direct-master</h1>
Methods to find a number of columns/rows in ODS table worked incorrectly. Particularly, API methods incorrectly handled a 'repetition attribute' which defined how many times the row/column was repeated in the document.

In this fix I just don't take into account the repetition attribute for last EMPTY rows and last EMPTY columns while calculating the number of rows/columns.

Also a cache of OdfShhets has been added to OdfWorkbook.