changed osl and piplib submodules' links from repo.or.cz to github.com
updated osl submodule
updated piplib submodule
Regenerated tests to work with osl statement_extensions
Add return code to tests/checker.sh
Merge pull request #6 from tajkhan/stmext
Update GNU build system to use last PipLib library
Merge branch 'master' of https://github.com/periscop/candl