Provide API to programmatically flush rendering cache from components for specified document.
Checkstyle fix
Allow to flush whole rendering cache programmatically
Code style fix
XWIKI-10890: Upgrade to JGroups 3.4.5
XWIKI-10855: Impossible to use a QueryExecutor installed as extension
XWIKI-10856: Stop initializing tons of components when creating a new XWikiDocument instance
* safer for retro-compatibility
XWIKI-10856: Stop initializing tons of components when creating a new XWikiDocument instance
* fix aspect
XWIKI-10856: Stop initializing tons of components when creating a new XWikiDocument instance
* update clirr setup
[misc] Fix typo
Merge pull request #305 from DarkKnightCZ/renderingcache

XWIKI-10897: Provide API to flush rendering cache
XWIKI-10780: Observation manager does not fully overwrite existing event listener
Revert "XWIKI-10780: Observation manager does not fully overwrite existing event listener"

This reverts commit 987984140f7ac7bdb8950b59c113c744c2ef2a71.
[Misc] Better link label
[Misc] replace "wiki" by "wikiId" in several places...
[Misc] Better link label (second try, thanks Sergiu)
XWIKI-10833: WebJars resources are not exported with the HTML exporter
XWIKI-10833: WebJars resources are not exported with the HTML exporter
* Put back old API I broke in previous commit (thanks CLIRR!)