XE-1325: Integrate the Workspaces feature by default in the default XE distribution.

* Merge with the commit 685df6920e342669005f6b064b7e5bb8ff563149 - XWIKI-9392: Search suggest should use Solr when the active search configuration is Solr.
Merge pull request #158 from gdelhumeau/master

XE-1325: Integrate the Workspaces feature by default in the default XE distribution.