Bug 190061 [Metadata] Update @since tags for new API
Patch to follow
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/CellEditor.java
* <code>false</code>.
     * </p>
     * <p>
     * Subclasses may override
     * </p>
     * @return <code>true</code> if delete is possible,
     *  <code>false</code> otherwise
     */
    public boolean isDeleteEnabled() {
        return false;
    }
    /**
     * Returns whether the value of this cell editor has changed since the
     * last call to <code>setValue</code>.
     *
     * @return <code>true</code> if the value has changed, and <code>false</code>
     *  if unchanged
     */
    public boolean isDirty() {
        return dirty;
    }
    /**
     * Marks this cell editor as dirty.
     * @since 2.1
     */
    protected void markDirty() {
        dirty = true;
    }
    /**
     * Returns <code>true</code> if this cell editor is