fix writing via XRootD (called from uproot) #76
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This PR fixes scikit-hep/uproot5#1252.
Touching (and truncating) a file on EOS (implemented here) needs the
Fileinterface in XRootD (as explained here).After this, other changes were needed, especially to allow for the
r+bmode used in uproot when opening a file. To do this, some functions such asseek,write,readwhere re-implemented instead of using the default ones inAbstractBufferedFile.Note: I believe some of these changes do not follow the logic that was originally implemented, so indications in this sense are much appreciated.