When checking bug #4959, some other bugs has been detected :
- switching language on publication was broken
- URL of images into WYSIWYG editor were not correct
fixing lost of translations on spaces and components relative to bug #4959

Conflicts:
	lib-core/src/main/java/com/stratelia/webactiv/beans/admin/ComponentInst.java
	lib-core/src/main/java/com/stratelia/webactiv/beans/admin/ComponentInstManager.java
	lib-core/src/main/java/com/stratelia/webactiv/beans/admin/SpaceInst.java
about feature #4574, fixing NPE when making a PDC search
Merge branch 'master' of github.com:Silverpeas/Silverpeas-Core
on feature #4574, uniforming location calculation (plain search VS PDC search)
fixing regression
Re-indexing publications was broken when i18n is not used
fixing bug relative to feature #4559
launching a search was no more possible on tab "Simple search"
some multilang entries were wrongly removed
Update the copyright header with the current year
[maven-release-plugin] prepare release core-5.13
[maven-release-plugin] prepare for next development iteration
set the correct version of the parent POM
update the version of the stable and snapshot silverpeas installer for the web site
The snapshot version of the installer now depends on the current project version
Add the release note of the version 5.13 of Silverpeas