Fix delete and add chart throws exception #990
Merged
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When new chart was created it's number was determined by the number of previously existing charts. This created a bug, when there were charts chart1.xml and chart2.xml, chart1 was deleted and the new chart was created. Since there is a chart already (chart2), the number for a new chart would be 2 (CountOfCharts + 1). This will throw an exception, because chart2.xml already exists.
Also added a RemoveChart method to XSSFDrawing and tests for the fixed bug and for the the RemoveChart method