* Fix flamingo theme test

* set proper entry type for pre configured admin user

* Correctly call shortcuts callbacks

* Load minified version of the library to bypass the filter

* add tests
* better handler of mandatory configuration documents

* even safer fix (make previous issue impossible even with bad code)

    * take into account delete setup

* take into account delete setup

* fix since annotation

This reverts commit 55c01a82.

Reason: Causing `java.lang.ClassCastException: java.lang.String cannot be cast to java.util.List` at `AbstractExtensionRESTResource.java:388`.

This reverts commit 0ecdabd1.

This reverts commit 7858624b.

Reason: It is currently the prime suspect for breaking the build and the tests. The XWiki instance has no panels, no administration option, silk icon themes and basic skin.

* tell yui compressor to not remove the comment with the Velocity code when minifying the JavaScript

XWIKI-15182: Wrong action in XWikiContext for extensions contributing a new entity action URL handler

* export_modal.vm uses the #documentTree() macro which belongs to documentTree_macros.vm
* we should explicitly include the .vm file containing the macro instead of relying on any other transitive .vm files inclusions

This reverts commit de4385dc.
because new system property needs more discussion

This reverts commit bf938e54.
because new system property needs more discussion