From Gerri and me: fix allowing:   f->Close()   f->ReOpen() to work. Before a closed file could not be reopened().
From Gerri and me:
fix allowing:
  f->Close()
  f->ReOpen()
to work. Before a closed file could not be reopened().


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@24655 27541ba8-7e3a-0410-8455-c3a389f83636

dawehner/root,dawehner/root,bbannier/ROOT,dawehner/root,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,dawehner/root,bbannier/ROOT,dawehner/root,bbannier/ROOT,bbannier/ROOT,dawehner/root,dawehner/root,dawehner/root