XCOMMONS-473: Upgrade to Clover 3.1.12
XWIKI-9548: Upgrade to Hibernate Validator 5.0.1
XWIKI-9549: Merge log does not end up in the XAR extension install log
XWIKI-9563: Extension install freezes under some circumstances
* Reuse the job status only if it corresponds to the current extension/dependency
* Make sure the Velocity macros that 'return' values don't have side effects (if there is an existing variable with the name of the 'return' variable then it is set to null).
XWIKI-9566: Make extension script service extensible
[Misc] Better disclaimer + by default consider an instance active if we have received a ping from it in the past 2 days (we send pings every day).
XWIKI-9566: Make extension script service extensible
XWIKI-9568: Escaping issue when passing queries to ElasticSearch from the UI
XWIKI-9535: Add ability to search for non SNAPSHOT installs
[Misc] Typo
XWIKI-4689: Previewing a new form-based document does not set the right document syntax
* also done some related cleanup and bulletproofing
XWIKI-4689: Previewing a new form-based document does not set the right document syntax
* BaseElement handling of the document reference is pretty weird...
XWIKI-4689: Previewing a new form-based document does not set the right document syntax
* mets not take too much risk with retro-comaptibility even when it does not make much sense
XWIKI-3492: Registration issues when email-verication/authentication enabled

Merge PR #113 by Thomas Delafosse.
Thanks.
XWIKI-6700 : Copying a page over an existing one does not warn user.

Merge PR #112 by Thomas Delafosse.
XWIKI-9279: Filtering by file type does not work
* Escape only the filter values that come from the user (the file type filter value contains a wildcard character that shouldn't be escaped).
XWIKI-7751: Saving a synthetic XWikiDocument always results in a DocumentCreat(ing/ed)Event instead of DocumentUpdat(ing/ed)Event when the document already exists
XWIKI-6700 : Copying a page over an existing one does not warn user.

Add and update PO for integration tests.
XWIKI-9279: Filtering by file type does not work
* Escape all values of a filter request parameter.
XWIKI-9547: SOLR search suggest does not find pages which end with number or special characters
* Look in name_exact field also because the name field is analyzed and foo2013* doesn't return any results, probably because it is considered a phrase search and the wildcard cannot be applied to a phrase.
* Also wrap the __INPUT__ with round brackets (group syntax) to properly support multi-word search.
XWIKI-9569: By default only count results for XE instances and for non-snapshot versions