Refactor ModelRangeManager::get_contiguous_node_id_range()

[heplesser]

ModelRangeManager::get_contiguous_node_id_range() uses linear search to find the model range to which a given node ID belongs. ModelRangeManager::get_node_id() does essentially the same thing but uses binary search and returns the model ID instead of a modelrange object.

Questions:

1. Can not one method be based on the other?
2. Should we use binary search for both?
3. Does the C++ standard library provide a binary search implementation we could use?

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