ROOTCOREDIR -> ROOTCOREBIN

ROOTCOREBIN is the directory from which we pick up the /data/* files.
ROOTCOREBIN and ROOTCOREDIR usually point to the same directory.
However, starting from RootCore-00-02-80 (pulled in by
SUSYTools-00-03-21, see [changeset578448], note that 02-80>02-99),
we see that some of the grid jobs cannot access
files through ROOTCOREDIR.


[changeset578448]: https://svnweb.cern.ch/trac/atlasoff/changeset/578448/PhysicsAnalysis/SUSYPhys/SUSYTools/trunk/python/install.py