ltlcross: recover from out-of-memory during state-space product
Fixes #96, reported by Vitus Lam & Christopher Ziegler. * src/bin/ltlcross.cc: Catch std::bad_alloc, skip those products and the related tests. Display a count of those skipped tests at the end. * NEWS: Mention it. * src/tests/ltlcross3.test: Adjust expected error message.
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