XWIKI-12306: A custom displayer should be executed in the security context of the document where it is located.

- Fixed failing test by properly applying the AdminSheet in space administration for an unexistent WebPreferences document.
-- The previous getRenderedContent approach was not setting the right sdoc.

- Minor codestyle improvements and javadoc

- Fixed tests

- Made the script right to DENY by default and to no longer be implied by edit. The rationale is that it will be set to ALLOW in the standard distribution's main wiki XWikiPreferences and the admin can DENY it if needed.

- Replaced deprecated usage in SkinAction

* cleanup

- Properly handled both top level terminal and non-terminal WebHome documents.
- Added unit tests.

* remove progressManager.endStep() calls that were not needed
* copy the WebPreferences (child) document when moving a document with deep=false in order to preserve the access rights at the new location
* use the EntityReferenceTree to ensure we iterate the document hierarchy in the right order (depth first) when deep=true
* Update the back-links and the relative links from the document content when performing a move/rename

* Update test coverage ratio.

* fix space open/close jingling bug

* Apply Thomas' suggestions

* fix unit tests

- Using new IDs for the spaceReference and name fields
- Added is/setTerminalPage methods

- Fixed the edit panels since they were not using the UIx mechanism as they were probably forgotten in the refactoring. They were failing to execute because they were using the deprecated #displayPanel macro.

- Checking script rights on the content author of the document where the title comes from instead of the current security document.

- Also added clirr exclusion.

- Deprecaed both core and api methods
- Replaced their usage in xwiki-plaform with #evaluate

* Add ability to disable the space redirect and fix the Scheduler test

* Make sure we don't require an internet connection to parse the Struts config file!

* Revert code that was committed by mistake (I didn't even know it was there! Must have been some copy paste in my IDE)

 * Fixed invalid dependency due to the module refactoring

* Fix one test I had forgotten to modify

* Fix bugs.

* Fix bug.