Languages harness 
There are 4 ways to run a language test:
- Overall Harness
- or
- Smoke testing
- or
- Selected languages
- Per Language Harness
- For almost all languages you can do something like:
- Run a single test for more detailed output.
make languages-test
cd languages && make test
make languages-smoke
cd languages && make smoke
cd languages && perl t/harness --languages=m4,punie
cd languages/tcl && make test
cd languages/tcl && prove t/joe_test.t
TODO
It should be possible to use non-Perl5 test files, like for languages/perl6, languages/pheme or languages/eclectus.
We are assuming that we are running out of parrot/languages; we are being called by languages/Makefile with an explicit perl.
