Bug 161401 [Viewers] Tweak ColumnViewer-API
- Rename getRowPart(Point point) => getViewerRow() - Rename getCell(Point point) => getViewerCell() - Rename setViewerColumn(final int columnIndex, ViewerColumn viewer) => setupEditingSupport - Make setupEditingSupport() private no one from external needs to use this API to set the EditingSupport for an ViewerColumn
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ColumnViewer.java
*/
	public ColumnViewer() {
		super();
		tooltipSupport = new ToolTipSupport(this);
	}
	/**
	 * Get the cell at this point.
	 * <p>
	 * <i>Subclasses should overwrite this method and provide a meaningful
	 * implementation</i>
	 * </p>
	 * 
	 * @param point
	 *            the point in the viewer where you need to corresponding cell
	 *            from
	 * @param onlyInSelection
	 *            search only in selection
	 * @return the cell or if no cell is found at this point
	 */
	ViewerCell getCell(Point point) {
		ViewerRow row = getRowPart(point);
		if (row != null) {
			return row.getCell(point);
		}
		return null;
	}
	/**
	 * Get the ViewerRow at point.
	 * 
	 * @param point