[NEW] Add elFinder to the File wizard page.
[ENH] Better description for ElFinder feature + add help URL
Make it easier to start using ElFinder. If found too unstable, it will be removed before the release.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@47645 b456876b-0849-0410-b77d-98878d47e9d5