adjust .gangarc

If there is a problem with oversized sandboxes, set it:

[LCG]
DefaultSE  = dcache-se-atlas.desy.de

The rest of the information can be found here: https://znwiki3.ifh.de/ATLAS/WorkBook/NAF/Grid%20Tools#head-670939a2ffa9dcd2fce8e6495aca2db8c7d80642

The adjusted .gangarc file can be found here: .gangarc

Working Ganga release is 5.1.10

Athena Python Version Clash

There is a clash with the python version of gliteatlas/grid setup and Athena. The workaround is to first set up the grid proxy:

ini gliteatlas
voms-proxy-init -voms atlas
unset PYTHONPATH

and then setup Athena (source cmthome/setup.sh).