Initializing help system before first use

# problem.addNewnodeCallback

Purpose
Declares a callback function that will be called every time a new node is created during the branch and bound search. This callback function will be called in addition to any callbacks already added by problem.addNewnodeCallback.
Topic areas
Callback, Branch and Bound Search
Synopsis
`problem.addNewnodeCallback(newnode, data=None, priority=0)`
`newnode(cbprob, cbdata, parentnode, node, branch)`
Arguments

newnode | The callback function, which takes arguments myprob, cbdata, parentnode, node and branch. This function is called every time a new node is created through branching.
data | A user-defined data to be passed to the callback function.
priority | An integer that determines the order in which callbacks of this type will be invoked. The callback added with a higher priority will be called before a callback with a lower priority. Set to 0 if not required.
cbprob | The problem passed to the callback function, newnode.
cbdata | The user-defined data passed as data when setting up the callback.
parentnode | Unique identifier for the parent of the new node.
node | Unique identifier assigned to the new node.
branch | The sequence number of the new node amongst the child nodes of parentnode. For regular branches on a MIP entity this will be either 0 or 1.

Further information
1. For regular branches on a MIP entity, branch will be either zero or one, depending on whether the new node corresponds to branching the MIP entity up or down.
2. When branching on a custom xpress.branchobj, branch refers to the given branch index of the data.
Related topics
problem.removeNewnodeCallback.
Parent Topic Methods of the class problem

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