XSLFTable handling - partly revert #1875901 ?

[Andreas Beeker]

Hi Alain,

please review revision 1875901.

I think it would be better to not add the cells in XSLFTable.initializeRow, as 
this changes a lot the way how the tables were used up till now.

So basically there are two modes in which to look at the tables:
* generating them from the scratch: so you would add each row and each cell 
explicitly like one would generate html tables
* adding a cell to an existing row like in Excel, where the cells of the 
surrounding rows need to be filled accordingly

I think the second operation could be provided more explicitly and not via a call to 
XSLFTableRow.addCell, i.e. there's too much "magic" involved for me.

Although I've fixed the growing table grid locally [1] this dependents on the 
above decision.

Best wishes,
Andi



[1] XSLFSheet ...:

@Override public XSLFTable createTable(int numRows,int numCols){
    if (numRows <1 || numCols <1) {
        throw new IllegalArgumentException("numRows and numCols must be greater than 
0");
    }
    XSLFTable sh = getDrawing().createTable();
    getShapes().add(sh);
    sh.setParent(this);
    for (int r=0; r<numRows; r++) {
        XSLFTableRow row = sh.addRow();
        if (r==0) {
            for (int c =0; c < numCols; c++) {
                row.addCell();
            }
        }
    }
    return sh;
}