getSplitInformationTree: get split information for all not terminal nodes in tree
In adibender/rFtools: Tools for the analysis of Random Forests (and cforest)

For a given tree-object this function returns the split information for each not terminal node in the tree.

1	getSplitInformationTree(tree = matrix(), inbagInd = logical(), X = matrix())

`tree`	A `matrix` as returned by `getTree`.
`inbagInd`	A `logical` indicating inbag observations.
`X`	A `matrix` containing the (SNP-) variables used in the call to `randomForest`.

A list with 3 components:

`indNodes`	A `logical` indicating inbag variables in the according nodes.
`ntSplits`	The actual split used in the according node. Gives the categories going to the left branch of the tree.
`splitVars`	The variables used for splitting the according nodes.