DOM range iterator incorrectly treats bookmark nodes as independent blocks

[martinkou]

Reproduction procedure:

1. Open sample01.html.
2. Press Ctrl-A inside the editing area to select all.
3. Press the Justify Center button, or the Indent button.
4. An unneeded, empty paragraph is created before the selected block.

After some investigation, it was found that the empty paragraph was created because the DOM range iterator in classes/fckdomrangeiterator.js is treating the empty <span> node created by FCKDomRange.CreateBookmark() as an independent block. The bookmark node is only a temporary node not meant to be part of the document, and so it should be ignored by the FCK DOM range iterator.

[fredck]

Fixed with [862] and [863].