Refactor integration tests to load examples from submodule
Add Compilation tests (executed by default)

Compilation tests test that the examples compile. That doesn't necessarily imply
correct results. See runtime tests for testing correct exitcodes or output.

The compilation tests are executed by the default run-tests ant target.
Add javac debug info to test/build.xml
Merge branch 'master' of github.com:swp-uebersetzerbau-ss13/fuc
Add regression test against return bug / activate print.prog