XWIKI-9874: Introduce getLastError() in the Wiki Script Service.
XWIKI-9883: Unable to save a new wiki descriptor with the script service

* Add unit tests too.
* Rename some private methods in test classes in wiki-template-script and wiki-user-script.
Merge branch 'master' of github.com:xwiki/xwiki-platform
XWIKI-9874: Introduce getLastError() in the Wiki Script Service.

* Fix typo.
[cleanup] Better logging + applied codestyle
[cleanup] Applied codestyle
XWIKI-9885: Add method to translate log in logging script service
XWIKI-7970: 'Show activity' link for a joined workspace does not work in the Workspaces section when JavaScript is turned off.

* Fix xhtml validity
* $request.category was wrong when javascript is enabled.
[cleanup] Applied codestyle
[misc] Commented out code that never works
XWIKI-9793: Improvements on 'File Size' facet
* Sort the file size ranges based on the number of matches.
XWIKI-9794: Improvements on 'Media Type' facet
* Group media types in categories that can be expanded/collapsed.
[misc] Optimize arrow icon used on the Solr search UI.
XWIKI-9874: Introduce getLastError() in the Wiki Script Service.

* Fix usages of getLastException which is deprecated now.
XWIKI-9670: Rewrite wikimanager REST API based on new wiki APIs.

* Remove the REST module of wiki-manager.
* Remove also the test module of wiki-manager because it only tests the REST api.
XWIKI-9670: Rewrite wikimanager REST API based on new wiki APIs.

* Remove useless file introduced by the last commit.
XWIKI-9795: Better way to handle advanced search options
* Removed the Advanced Search options since all filters have been moved to facets.
* The query boost option is no longer available but you can achieve the same thing from the query input and we'll add later a query boost configuration in the search administration section.
* Improve the display of the debug information (when search debug mode is enabled).
* Preserve the current facet values when submitting a new search query.
[misc] Fix typo.
XWIKI-9894: Document new Data URI scheme support for images
XWIKI-9887: When changing the owner of a wiki, wiki owner security access rights are not updated
XWIKI-9887: When changing the owner of a wiki, wiki owner security access rights are not updated