on feature #5515, adding support of media in news content.
A conflict have been detected when two fields uses 'bank of images' on the same page, improving code of thumbnail service to avoid it.
on feature #5517, fixing few bugs :
- modifying silverpeas-identitycard.js and silverpeas-userZoom.js to be more usable (activation on demand)
- modifying WYSIWYG plugin 'userZoom' to no longer be in conflict with WISYWIG plugin 'identityCard'
on feature #5756, identifying some forgotten 'popup' pages
fixing bug #5928 :
- updating space homepage type if it was deleted component
- using default space homepage if component is not available to user
fixing bug #5929
on feature #5515 :
- fixing a problem around Silverpeas plugins associated to CKEditor
Merge branch 'ney-bugs-fmm' into core-5.15.x