jsroot: fix I/O errors, support ROOT4 files (like in Geant4)
jsroot: fix I/O errors, support ROOT4 files (like in Geant4)

Main difference with current ROOT files - older ROOT files
do not have check size in the beginning of each buffer.
Now is possible to open files written with Geant4.

Signed-off-by: Bertrand Bellenot <6715f273cb2881a3bfbd56f899a7173358fb0b89@cern.ch>

tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot