Refactor timeout scaling factor initialization In order to stabilize tests on (heavily loaded) CI infrastructure, reasses scaling factor every three minutes. Also include (simple) I/O benchmark to compensate for (overloaded) I/O subsystem of CI slaves. For details, see `Builder::TestReport::Result >> timeoutScale`

#!/bin/sh
DIR=`dirname $0`
exec "$DIR/../../../projects/smalltalk/stx" -Mold:64000 -I --abortOnSEGV --execute "$DIR/report-runner.st" "$@"