In LauFitDataTree::readExperimentData add a check that the tree contains the branch "iExpt" and if not: - If the requested experiment is 0 then read all data in the tree (and print a warning) - Otherwise print an error message and return

git-svn-id: svn+ssh://phab.hepforge.org/source/laurasvn/trunk@527 30227d83-a2f9-49e9-9e98-657c83b2c86a