Add new method for extArg import to reduce memory consumption #313
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When parsing large models where the
extArgparameters are imported multiple times with RooWorkspace::import the process gets killed due to the large memory consumption.This PR tries to avoid using this method if the pointer to the workspace is already created. Also this fix might not be relevant after with ROOT version>= 6.28 since it looks like the TFile is created with std::unique_ptr see here