a4atlas: Make checks depending on installation install_ checks
travis: Also do install checks
Update valgrind suppression files
waf: Exit with code -1 if unit tests fail
Update travis to actually catch test failures
valgrind: Add Value4 suppression to python
a4io: Change start compressed section handling in python to examine travis build failure
Merge pull request #210 from JohannesEbke/testing_fixes

Testing fixes