Bug 172814 [Viewers] Rename AbstractViewerEditor to ColumnViewerEditor
There is no "AbstractViewer", and this class is referenced from ColumnViewer. To make the names more consistent, it should be called ColumnViewerEditor, not AbstractViewerEditor.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ColumnViewer.java
* already done in the cell editor are lost.
	 * 
	 * @since 3.1 (in subclasses, added in 3.3 to abstract class)
	 */
	public void cancelEditing() {
		if (viewerEditor != null) {
			viewerEditor.cancelEditing();
		}
	}
	/**
	 * Apply the value of the active cell editor if one is active.
	 * 
	 * @since 3.3
	 */
	protected void applyEditorValue() {
		if (viewerEditor != null) {
			viewerEditor.applyEditorValue();
		}
	}
	/**
	 * Starts editing the given element at the given column index.
	 * 
	 * @param element
	 *            the element
	 * @param column
	 *            the column index
	 * @since 3.1 (in subclasses, added in 3.3 to abstract class)
	 */
	public void editElement(Object element, int column) {
		if (viewerEditor != null) {