use 30 s instead of 60 s as the default Sledgehammer timeout;
very few proofs are lost this way (esp. thanks to the parallel use of provers, cf. Boehme & Nipkow 2010), and this is much more tolerable for users
#!/usr/bin/env bash
#
# Minimal Poly/ML startup script
THIS="$(cd "$(dirname "$0")"; pwd)"
export LD_LIBRARY_PATH="$THIS:$LD_LIBRARY_PATH"
export DYLD_LIBRARY_PATH="$THIS:$DYLD_LIBRARY_PATH"
exec "$THIS/poly" "$@"