ECMS-6227 | ECMS-6227  Improve code on template of file UIToolbarContainer.gtmpl
ECMS-6265: SitesExplorer Tree disappears

Problem analysis
- Refreshing Explorer frame causes wrong updating current tab in Side Bar

Fix description
- Only refesh Explorer frame by ajax
SWF-2923 : Create pkg-improv branch and update projects versions
Use maven-parent-pom 13-SNAPSHOT
Jaxen was a JDom dependency for version before 1.1.3
Its removal may create some issues for components requiring it
PLF-5900 : Use EXOGTN for eXo Platform Community
PLF-5684 : Declare the source release package used to bundle all PLF sources