PLF-5815: eXo in iframe issues

Problem analysis
- Web browser will be reloaded when selecting space

Fix description
- Only redirect appropriated frame
PLF-5728: Use custom data validator for Navigation Node's Name

Fix description:
* Use custom identifier validator for Page Node Form. The validator is defined as system properties.
PLF-5648: Unknown Error when cutting a node into its child.

Fix description:
* Forbid to move a node into its child.