title: c++, insert only numbers (double) in a QTableWidget
body: <p>I'm creating a sort of little spreadshirt and I need to insert only numbers in all the cells of a column.</p>
  
  <p>Is there anyway to do this just with the tablewidget or do I need to "fill" table with LineEdit and then restict on some way the LineEdit input?</p>
  
  <p>Can someone point me to the right direction?</p>