XWIKI-10608 use getXWikiPreference('admin_email') if it is filled

http://jira.xwiki.org/browse/XWIKI-10608
Move User and Group displays into a macro
missing translation in export menu in flamingo skin
XWIKI-10838: WYSIWYG has 2 levels of bold: one introduced by Flamingo's heading and the standard one (<strong>).
XWIKI-10943: AWM: Property header buttons don't respond.
XWIKI-10922: Exporting in HTML fails when the skin is not specified as a wiki page in the Administration
XWIKI-10933: HTML export of home page has the Dashboard not displaying nicely
XWIKI-10933: HTML export of home page has the Dashboard not displaying nicely
* Improve performances...
XWIKI-10907: Lots of warnings in the logs: Deprecated usage of method [org.apache.velocity.tools.generic.ListTool.get]
* Fixed a few places, a lot more remaining...
XWIKI-10907: Lots of warnings in the logs: Deprecated usage of method [org.apache.velocity.tools.generic.ListTool.get]
* More fixes...
XWIKI-10907: Lots of warnings in the logs: Deprecated usage of method [org.apache.velocity.tools.generic.ListTool.get]
* And more...
XWIKI-10957: CheckAnnotationClassEventListener should be replaced by a mandatory document initializer
XWIKI-10959: Wiki macros classes should be initialized trough a mandatory document initializer
XWIKI-10958: Wiki macros initializer should register macros only for current wiki at init
[misc] Remove missleading comment marker
XWIKI-10960: $xwiki.checkAccess($someDoc, 'programming') always fails
Fixed
XWIKI-10940: Breadcrumb is not well displayed and it's overlapping on ie8.
Update content.vm
Update ApplicationResources.properties
XWIKI-10964: BaseClass#fromXML(Element cel) produces and catches tons of exceptions
XWIKI-10965: DefaultDocumentDisplayer#display(DocumentModelBridge document, DocumentDisplayerParameters parameters) produces and catches lots of exceptions