Add hello world tests for all languages (enabled when RELEASE_TESTING is true)
- [DBH] t/problems/hello/1.in
- [DBH] t/problems/hello/1.ok
- [DBH] t/problems/hello/meta.yml
- [DBH] t/problems/hello/tests/c/meta.yml
- [DBH] t/problems/hello/tests/c/prog.c
- [DBH] t/problems/hello/tests/cpp/meta.yml
- [DBH] t/problems/hello/tests/cpp/prog.cpp
- [DBH] t/problems/hello/tests/gccgo/meta.yml
- [DBH] t/problems/hello/tests/gccgo/prog.go
- [DBH] t/problems/hello/tests/golang/meta.yml
- [DBH] t/problems/hello/tests/golang/prog.go
- [DBH] t/problems/hello/tests/haskell/meta.yml
- [DBH] t/problems/hello/tests/haskell/prog.hs
- [DBH] t/problems/hello/tests/java/meta.yml
- [DBH] t/problems/hello/tests/java/prog.java
- [DBH] t/problems/hello/tests/mono/meta.yml
- [DBH] t/problems/hello/tests/mono/prog.cs
- [DBH] t/problems/hello/tests/mono/prog.exe
- [DBH] t/problems/hello/tests/pascal/meta.yml
- [DBH] t/problems/hello/tests/pascal/prog.pas
- [DBH] t/problems/hello/tests/perl/meta.yml
- [DBH] t/problems/hello/tests/perl/prog.pl
- [DBH] t/problems/hello/tests/python/meta.yml
- [DBH] t/problems/hello/tests/python/prog.py