title: ios UITableView -> UITableViewCellSeparatorStyleNone leaves a line of one pixel height blank
body: <p>I want to omit the separation line between two tableview cells. But instead of no separator I get a separation line of height 1 pixel that is simply left blank or better said completly transparent. </p>
  
  <p>How can I tell the uitableview how to attach the next cell directly to the cell above (without any gap)?</p>