bwc.pl wants absolute paths while it should also cope with relative
Imported issue: Initially reported by @thome in https://gforge.inria.fr/tracker/?group_id=2065&aid=21406
It's annoying for examples. Even more so because the error message is completely arcane.
cd ~thome
cp /data/guillevi/p6bd12.hd.s* .
~/cado/build/catrel/linalg/bwc/bwc.pl :complete --matrix p6bd12.hd.sparse.bin --rhs p6bd12.hd.sm prime=33301 nullspace=right m=10 n=10 interval=10 wdir=$PWD/test