updated GraphViz folder name (version)
changes to ravendb solution - to make build script work (consequence of framework upgrade to 4.5)
Squashed 'Raven.Voron/' changes from 3bf3e41..5645ed8

5645ed8 rebalancer bug fix
52b1874 rebalancer bug reproduction
dbe3d53 added precaution code to MultiDelete
97fe5ba change visibility to public of tx.GetTree

git-subtree-dir: Raven.Voron
git-subtree-split: 5645ed89527ad37f2fa2da683072d3678a113602
Merge commit '15eaca5b1b12831a50f57d4144c56e8ed8eb32da' into 2.5-voron
All conflicts resolved "using theirs"
Conflicts:
	Raven.Voron/Voron.Tests/Bugs/MultiAdds.cs
	Raven.Voron/Voron/Impl/Transaction.cs
	Raven.Voron/Voron/Trees/Page.cs
	Raven.Voron/Voron/Trees/Tree.cs
	Raven.Voron/Voron/Trees/TreeIterator.cs
	Raven.Voron/Voron/Trees/TreeRebalancer.cs
added missing file
added missing file (deleted by mistake)