* Separate build integration tests; simplify test scripts
- Move build tests out of the regular Travis unit tests, add more smoke
test packages to build.
- Run all test scripts with bash -e, which fails on error.
- Factor coverage out into a Travis environment variable, so it's more
obvious from .travis.yml which tests contribute to coverage and which
don't.
- Factor dependency checking and much of the front-matter in tests
scripts into a setup.sh script, which is sourced by all the test
scripts. Extra cruft in each tests script now reduced to 2 lines at
the beginning.
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