[ENH]Added page with info about main new features and settings in Tiki13. Please improve those of you who know what else was added (I just did add some infos from what I could find at http://doc.tiki.org/Tiki13 )

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@51221 b456876b-0849-0410-b77d-98878d47e9d5
[FIX]Button should show "Next" and not "Save and continue"

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@51222 b456876b-0849-0410-b77d-98878d47e9d5